<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:4d0ab68f-2c79-4317-8cf4-8a529404fc43,g:7badd62e-bed6-428f-a793-250f736355d1-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://dineequity.com/role/ConsolidatedStatementsofComprehensiveIncome" xlink:type="simple" xlink:href="din-20250630.xsd#ConsolidatedStatementsofComprehensiveIncome"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/ConsolidatedStatementsofComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_f809f29e-85b0-4f3e-84ec-884f5f6b6c15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_StatementTable_f809f29e-85b0-4f3e-84ec-884f5f6b6c15" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_e5539d34-1873-43a1-a30e-8e81e8c9cf86" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_f809f29e-85b0-4f3e-84ec-884f5f6b6c15" xlink:to="loc_srt_ProductOrServiceAxis_e5539d34-1873-43a1-a30e-8e81e8c9cf86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_e5539d34-1873-43a1-a30e-8e81e8c9cf86_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_e5539d34-1873-43a1-a30e-8e81e8c9cf86" xlink:to="loc_srt_ProductsAndServicesDomain_e5539d34-1873-43a1-a30e-8e81e8c9cf86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_bf37151d-4cc1-4efa-9feb-bc496223258b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_e5539d34-1873-43a1-a30e-8e81e8c9cf86" xlink:to="loc_srt_ProductsAndServicesDomain_bf37151d-4cc1-4efa-9feb-bc496223258b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorMember_1cb3b0f3-f94f-491d-bd1b-9e1e77108292" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FranchisorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bf37151d-4cc1-4efa-9feb-bc496223258b" xlink:to="loc_us-gaap_FranchisorMember_1cb3b0f3-f94f-491d-bd1b-9e1e77108292" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FranchisorRoyaltiesfranchisefeesandotherMember_b06d72f0-e136-45a3-82c0-311643feeec4" xlink:href="din-20250630.xsd#din_FranchisorRoyaltiesfranchisefeesandotherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorMember_1cb3b0f3-f94f-491d-bd1b-9e1e77108292" xlink:to="loc_din_FranchisorRoyaltiesfranchisefeesandotherMember_b06d72f0-e136-45a3-82c0-311643feeec4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FranchisorAdvertisingRevenueMember_1a7573b2-d310-46f0-9aa3-ca9865f824ac" xlink:href="din-20250630.xsd#din_FranchisorAdvertisingRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorMember_1cb3b0f3-f94f-491d-bd1b-9e1e77108292" xlink:to="loc_din_FranchisorAdvertisingRevenueMember_1a7573b2-d310-46f0-9aa3-ca9865f824ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FoodAndBeverageMember_2cc5b44d-b3e2-4c7d-bbb1-4e7e72daf1eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FoodAndBeverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bf37151d-4cc1-4efa-9feb-bc496223258b" xlink:to="loc_us-gaap_FoodAndBeverageMember_2cc5b44d-b3e2-4c7d-bbb1-4e7e72daf1eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingMember_bd7bcc21-96ae-4d2d-8168-57d85bc92d4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdvertisingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bf37151d-4cc1-4efa-9feb-bc496223258b" xlink:to="loc_us-gaap_AdvertisingMember_bd7bcc21-96ae-4d2d-8168-57d85bc92d4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchiseMember_f8daee0f-d6d7-40fa-b8ea-d95950f92478" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FranchiseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_bf37151d-4cc1-4efa-9feb-bc496223258b" xlink:to="loc_us-gaap_FranchiseMember_f8daee0f-d6d7-40fa-b8ea-d95950f92478" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_4bcb7495-8409-4d97-a9f9-5415b1b2e3cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_RevenuesAbstract_4bcb7495-8409-4d97-a9f9-5415b1b2e3cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_fb2e7dc9-19e4-4f4e-9f91-f87416877a40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_4bcb7495-8409-4d97-a9f9-5415b1b2e3cf" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_fb2e7dc9-19e4-4f4e-9f91-f87416877a40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RentalIncome_a5d915e6-0b23-405d-aa44-8214cb4b5862" xlink:href="din-20250630.xsd#din_RentalIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_4bcb7495-8409-4d97-a9f9-5415b1b2e3cf" xlink:to="loc_din_RentalIncome_a5d915e6-0b23-405d-aa44-8214cb4b5862" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueNotFromContractWithCustomerOther_950770f8-24af-4aea-b938-80d6b10b9fc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueNotFromContractWithCustomerOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_4bcb7495-8409-4d97-a9f9-5415b1b2e3cf" xlink:to="loc_us-gaap_RevenueNotFromContractWithCustomerOther_950770f8-24af-4aea-b938-80d6b10b9fc1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_7695c0a2-f5b4-4779-b522-0ee716b01853" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_4bcb7495-8409-4d97-a9f9-5415b1b2e3cf" xlink:to="loc_us-gaap_Revenues_7695c0a2-f5b4-4779-b522-0ee716b01853" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_f47c807b-c214-4c3a-85fa-4262d0506726" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_f47c807b-c214-4c3a-85fa-4262d0506726" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_8e7702e9-22cc-4160-9051-4a04aa325ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_8e7702e9-22cc-4160-9051-4a04aa325ee6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostOfOperatingRevenue_b45f1e69-fc76-4408-a4c7-4f114de13ccb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostOfOperatingRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:to="loc_us-gaap_OtherCostOfOperatingRevenue_b45f1e69-fc76-4408-a4c7-4f114de13ccb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RentalFinanceLeaseInterestExpense_a079a9a1-9c04-4ec1-b15d-bcc5ab3164c3" xlink:href="din-20250630.xsd#din_RentalFinanceLeaseInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:to="loc_din_RentalFinanceLeaseInterestExpense_a079a9a1-9c04-4ec1-b15d-bcc5ab3164c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RentalExpensesOther_8f66384b-7a81-4b65-ac0c-e85a8a469755" xlink:href="din-20250630.xsd#din_RentalExpensesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:to="loc_din_RentalExpensesOther_8f66384b-7a81-4b65-ac0c-e85a8a469755" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RentalExpenses_50a1c948-9221-45f1-92eb-c0b79743de21" xlink:href="din-20250630.xsd#din_RentalExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:to="loc_din_RentalExpenses_50a1c948-9221-45f1-92eb-c0b79743de21" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingInterestExpense_43315ce1-0556-47ae-ad2a-bed591034de6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:to="loc_us-gaap_FinancingInterestExpense_43315ce1-0556-47ae-ad2a-bed591034de6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_4b6d657b-b1f5-48af-958c-15caf591e5cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_2aa7ec33-cbac-49b1-91c5-2cf65efab392" xlink:to="loc_us-gaap_CostOfRevenue_4b6d657b-b1f5-48af-958c-15caf591e5cf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_72c07ae5-ce45-486e-8f5e-03f122bcfcaa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_GrossProfit_72c07ae5-ce45-486e-8f5e-03f122bcfcaa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_4764ebf0-57b0-4b5a-b3b1-82f411b07546" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_4764ebf0-57b0-4b5a-b3b1-82f411b07546" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRevenueExpenseNet_afb14543-0773-424c-9024-c90a4c6a0814" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRevenueExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_InterestRevenueExpenseNet_afb14543-0773-424c-9024-c90a4c6a0814" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_931faf7f-40d3-4115-b9bd-030e45008102" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_931faf7f-40d3-4115-b9bd-030e45008102" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_28f6ad44-a741-4b87-b6c7-7be3ab0c7ff6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_28f6ad44-a741-4b87-b6c7-7be3ab0c7ff6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_85842b52-a740-481f-bbab-1f37684b3a47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_85842b52-a740-481f-bbab-1f37684b3a47" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_7c280f0a-49b1-42ff-a634-e834ed1109d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_7c280f0a-49b1-42ff-a634-e834ed1109d7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_883dc167-da38-44f0-a1ea-ab1f7aeec8d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_883dc167-da38-44f0-a1ea-ab1f7aeec8d1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_94748616-3376-4b9c-8f17-2fea08468933" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_94748616-3376-4b9c-8f17-2fea08468933" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_4c013288-fdc7-4b75-a63e-21fc44931339" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_NetIncomeLoss_4c013288-fdc7-4b75-a63e-21fc44931339" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ec8b8e1c-3452-4fcb-8457-93d8c4829a3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ec8b8e1c-3452-4fcb-8457-93d8c4829a3e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_bdc0dce6-0783-44e8-940e-83716f08ea47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ec8b8e1c-3452-4fcb-8457-93d8c4829a3e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_bdc0dce6-0783-44e8-940e-83716f08ea47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_9f1f22b7-eee0-44a8-9f47-00a0c20e55c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_ec8b8e1c-3452-4fcb-8457-93d8c4829a3e" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_9f1f22b7-eee0-44a8-9f47-00a0c20e55c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_828539bd-691f-40c6-8e48-3e2f0d643453" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_828539bd-691f-40c6-8e48-3e2f0d643453" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_928f6ddd-ab20-408a-b39b-5872ba7c4e78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_0ecfdcc1-a9b3-42c9-943f-70b24fcc986d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_828539bd-691f-40c6-8e48-3e2f0d643453" xlink:to="loc_us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic_0ecfdcc1-a9b3-42c9-943f-70b24fcc986d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_4ab0177b-f7ed-4481-b56a-9d728c67b3a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_828539bd-691f-40c6-8e48-3e2f0d643453" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_4ab0177b-f7ed-4481-b56a-9d728c67b3a0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_c8b9a573-bacf-498b-8518-21f04039aadf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_EarningsPerShareAbstract_c8b9a573-bacf-498b-8518-21f04039aadf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_af830051-2c6e-4b1a-bd57-904a501d17f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_c8b9a573-bacf-498b-8518-21f04039aadf" xlink:to="loc_us-gaap_EarningsPerShareBasic_af830051-2c6e-4b1a-bd57-904a501d17f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_c2eeadf4-01ad-44ea-8dbc-aebf8daaeb69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_c8b9a573-bacf-498b-8518-21f04039aadf" xlink:to="loc_us-gaap_EarningsPerShareDiluted_c2eeadf4-01ad-44ea-8dbc-aebf8daaeb69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_f9b00523-a979-4ef5-b4fd-c8bf3badb139" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7f8a49ed-1da6-4f81-9020-ab75dd257e53" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_f9b00523-a979-4ef5-b4fd-c8bf3badb139" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3e92eee9-bc13-42bb-9572-be46581b4c17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_f9b00523-a979-4ef5-b4fd-c8bf3badb139" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_3e92eee9-bc13-42bb-9572-be46581b4c17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_0ad6e312-a740-4b9c-93fb-e40ee83e137f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_f9b00523-a979-4ef5-b4fd-c8bf3badb139" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_0ad6e312-a740-4b9c-93fb-e40ee83e137f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/ConsolidatedStatementsofStockholdersDeficit" xlink:type="simple" xlink:href="din-20250630.xsd#ConsolidatedStatementsofStockholdersDeficit"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/ConsolidatedStatementsofStockholdersDeficit" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_3354196a-c75a-41ce-9974-1465ca4ed5f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_88937794-c2ce-4c07-8c64-e9e30a87dbe1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_3354196a-c75a-41ce-9974-1465ca4ed5f6" xlink:to="loc_us-gaap_StatementTable_88937794-c2ce-4c07-8c64-e9e30a87dbe1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_5ec37ff8-3bcb-4284-b71b-e48019502416" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_88937794-c2ce-4c07-8c64-e9e30a87dbe1" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_5ec37ff8-3bcb-4284-b71b-e48019502416" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5ec37ff8-3bcb-4284-b71b-e48019502416_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5ec37ff8-3bcb-4284-b71b-e48019502416" xlink:to="loc_us-gaap_EquityComponentDomain_5ec37ff8-3bcb-4284-b71b-e48019502416_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_1c11ea54-a43b-41ff-8d30-2a38ef04c7d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5ec37ff8-3bcb-4284-b71b-e48019502416" xlink:to="loc_us-gaap_EquityComponentDomain_1c11ea54-a43b-41ff-8d30-2a38ef04c7d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_5b608aef-b9e6-4519-935a-5bf29032582e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1c11ea54-a43b-41ff-8d30-2a38ef04c7d6" xlink:to="loc_us-gaap_CommonStockMember_5b608aef-b9e6-4519-935a-5bf29032582e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_4f1bfcf1-80e0-4b9d-bb41-17ee4f471d7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1c11ea54-a43b-41ff-8d30-2a38ef04c7d6" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_4f1bfcf1-80e0-4b9d-bb41-17ee4f471d7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_f92c52c1-cfc3-4e0b-b24f-c3652128ee99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1c11ea54-a43b-41ff-8d30-2a38ef04c7d6" xlink:to="loc_us-gaap_RetainedEarningsMember_f92c52c1-cfc3-4e0b-b24f-c3652128ee99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_d0cd034b-e9e6-4185-a63d-9b05bb60a502" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1c11ea54-a43b-41ff-8d30-2a38ef04c7d6" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_d0cd034b-e9e6-4185-a63d-9b05bb60a502" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_393f74e5-a05d-4628-8cc0-d181220ddb59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1c11ea54-a43b-41ff-8d30-2a38ef04c7d6" xlink:to="loc_us-gaap_TreasuryStockCommonMember_393f74e5-a05d-4628-8cc0-d181220ddb59" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3354196a-c75a-41ce-9974-1465ca4ed5f6" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_fc5bf9b3-0e36-45b6-bfa4-6ab4c7bf8071" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_fc5bf9b3-0e36-45b6-bfa4-6ab4c7bf8071" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_c20dbf8e-8159-4ec7-b4a6-1bb68751191c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_StockholdersEquity_c20dbf8e-8159-4ec7-b4a6-1bb68751191c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_7657fd63-dac3-465e-abff-39c919819894" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_TreasuryStockCommonShares_7657fd63-dac3-465e-abff-39c919819894" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_e9c26b7e-1431-480f-b7b0-5e2be9fc55ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_NetIncomeLoss_e9c26b7e-1431-480f-b7b0-5e2be9fc55ae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_887b4f35-6388-44bb-b20d-47ff89426a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_887b4f35-6388-44bb-b20d-47ff89426a4e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_87bae8d2-67e3-4bd1-8552-266c9bf4e052" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_87bae8d2-67e3-4bd1-8552-266c9bf4e052" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_a7b3bae0-7d57-403b-9613-a03ba8f3ea04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_a7b3bae0-7d57-403b-9613-a03ba8f3ea04" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued_8f2dd595-3267-4cbf-be20-35f9933a39d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued_8f2dd595-3267-4cbf-be20-35f9933a39d3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_StockIssuedDuringPeriodValueTreasuryStockReissuedParValueAdjustment_25563fec-fa1e-491b-8a1d-8327de6aa188" xlink:href="din-20250630.xsd#din_StockIssuedDuringPeriodValueTreasuryStockReissuedParValueAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_din_StockIssuedDuringPeriodValueTreasuryStockReissuedParValueAdjustment_25563fec-fa1e-491b-8a1d-8327de6aa188" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_59fc8d67-d4fb-4354-8ee2-b9c4d060c09f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_59fc8d67-d4fb-4354-8ee2-b9c4d060c09f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_8ea4ab8c-1367-4675-8617-00e6d9ea43f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_8ea4ab8c-1367-4675-8617-00e6d9ea43f9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RestrictedStockRepurchasedDuringPeriodShares_c9253dc7-7206-4e31-a6ba-8c93f2b79184" xlink:href="din-20250630.xsd#din_RestrictedStockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_din_RestrictedStockRepurchasedDuringPeriodShares_c9253dc7-7206-4e31-a6ba-8c93f2b79184" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RestrictedStockRepurchasedDuringPeriodValue_ba4d4f63-28c2-4b8f-a06e-9e1ac03f54c3" xlink:href="din-20250630.xsd#din_RestrictedStockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_din_RestrictedStockRepurchasedDuringPeriodValue_ba4d4f63-28c2-4b8f-a06e-9e1ac03f54c3" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_f86e4d58-7026-4886-89cd-3929edce2ecf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_f86e4d58-7026-4886-89cd-3929edce2ecf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStock_ccf5653e-f379-4ad3-80e0-8b8580bdb90a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_DividendsCommonStock_ccf5653e-f379-4ad3-80e0-8b8580bdb90a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_bd8b479f-b277-4200-9211-082273ce9781" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_12975d79-22a9-46a0-84f5-d2e0aac57552" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_bd8b479f-b277-4200-9211-082273ce9781" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_f54815f1-823f-4fbe-ab45-847d67892140" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_e6fa3e9f-b375-4d97-92a7-af9d86e3bb6f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_f415e9fb-8103-473a-8106-469bb99122a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/RevenuesDisaggregationofFranchiseRevenuebyMajorTypeDetails" xlink:type="simple" xlink:href="din-20250630.xsd#RevenuesDisaggregationofFranchiseRevenuebyMajorTypeDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/RevenuesDisaggregationofFranchiseRevenuebyMajorTypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_5063ca8b-c2c3-4c0e-b420-d0d35196d7d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_12c5ca86-9baf-43b3-bf12-9048cf148f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5063ca8b-c2c3-4c0e-b420-d0d35196d7d5" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_12c5ca86-9baf-43b3-bf12-9048cf148f8a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_24193948-9063-4183-a228-52af623c2bd4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_12c5ca86-9baf-43b3-bf12-9048cf148f8a" xlink:to="loc_srt_ProductOrServiceAxis_24193948-9063-4183-a228-52af623c2bd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_24193948-9063-4183-a228-52af623c2bd4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_24193948-9063-4183-a228-52af623c2bd4" xlink:to="loc_srt_ProductsAndServicesDomain_24193948-9063-4183-a228-52af623c2bd4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_b33d3804-c969-40ee-9beb-82c72cafb5db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_24193948-9063-4183-a228-52af623c2bd4" xlink:to="loc_srt_ProductsAndServicesDomain_b33d3804-c969-40ee-9beb-82c72cafb5db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorMember_d66bfda5-3f37-49a4-98c4-0ffa7243febe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FranchisorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_b33d3804-c969-40ee-9beb-82c72cafb5db" xlink:to="loc_us-gaap_FranchisorMember_d66bfda5-3f37-49a4-98c4-0ffa7243febe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RoyaltiesMember_fb20ee26-665c-47c3-907e-3a2325b5ee91" xlink:href="din-20250630.xsd#din_RoyaltiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorMember_d66bfda5-3f37-49a4-98c4-0ffa7243febe" xlink:to="loc_din_RoyaltiesMember_fb20ee26-665c-47c3-907e-3a2325b5ee91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingMember_ad4f4d33-89a2-4842-90b2-c7c2678d6983" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdvertisingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorMember_d66bfda5-3f37-49a4-98c4-0ffa7243febe" xlink:to="loc_us-gaap_AdvertisingMember_ad4f4d33-89a2-4842-90b2-c7c2678d6983" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_ProprietaryProductSalesAndOtherMember_c4fab895-c9a6-4849-bfdb-a77d570a90b5" xlink:href="din-20250630.xsd#din_ProprietaryProductSalesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorMember_d66bfda5-3f37-49a4-98c4-0ffa7243febe" xlink:to="loc_din_ProprietaryProductSalesAndOtherMember_c4fab895-c9a6-4849-bfdb-a77d570a90b5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FranchiseAndDevelopmentFeesMember_49e123d8-f56c-46b1-a6eb-0af99b67af4f" xlink:href="din-20250630.xsd#din_FranchiseAndDevelopmentFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorMember_d66bfda5-3f37-49a4-98c4-0ffa7243febe" xlink:to="loc_din_FranchiseAndDevelopmentFeesMember_49e123d8-f56c-46b1-a6eb-0af99b67af4f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_eb8f4f45-af31-4fdd-91ad-a33cea5736c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5063ca8b-c2c3-4c0e-b420-d0d35196d7d5" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_eb8f4f45-af31-4fdd-91ad-a33cea5736c0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/RevenuesDeferredRevenueExpectedtobeRecognizedDetails" xlink:type="simple" xlink:href="din-20250630.xsd#RevenuesDeferredRevenueExpectedtobeRecognizedDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/RevenuesDeferredRevenueExpectedtobeRecognizedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_c6727f48-87bc-4720-abe5-0c10a20bff95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_3e39c0c2-235a-400e-b855-1a6ca31dbe32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_c6727f48-87bc-4720-abe5-0c10a20bff95" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_3e39c0c2-235a-400e-b855-1a6ca31dbe32" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_e2564ef9-3e6e-4677-9dcf-fac190f3ab50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_3e39c0c2-235a-400e-b855-1a6ca31dbe32" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_e2564ef9-3e6e-4677-9dcf-fac190f3ab50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_406d95de-7a0c-4cd9-80c4-957a2aaae021" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_c6727f48-87bc-4720-abe5-0c10a20bff95" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_406d95de-7a0c-4cd9-80c4-957a2aaae021" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_0fa716c7-b81f-4506-bb7d-c762f8ec7be3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_c6727f48-87bc-4720-abe5-0c10a20bff95" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_0fa716c7-b81f-4506-bb7d-c762f8ec7be3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/RevenuesDeferredRevenueExpectedtobeRecognizedDetails_1" xlink:type="simple" xlink:href="din-20250630.xsd#RevenuesDeferredRevenueExpectedtobeRecognizedDetails_1"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/RevenuesDeferredRevenueExpectedtobeRecognizedDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_c6727f48-87bc-4720-abe5-0c10a20bff95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_3e39c0c2-235a-400e-b855-1a6ca31dbe32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_c6727f48-87bc-4720-abe5-0c10a20bff95" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_3e39c0c2-235a-400e-b855-1a6ca31dbe32" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_406d95de-7a0c-4cd9-80c4-957a2aaae021" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_c6727f48-87bc-4720-abe5-0c10a20bff95" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_406d95de-7a0c-4cd9-80c4-957a2aaae021" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_0fa716c7-b81f-4506-bb7d-c762f8ec7be3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_c6727f48-87bc-4720-abe5-0c10a20bff95" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_0fa716c7-b81f-4506-bb7d-c762f8ec7be3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/ReceivablesandCurrentExpectedCreditLossesCECLNarrativeDetails" xlink:type="simple" xlink:href="din-20250630.xsd#ReceivablesandCurrentExpectedCreditLossesCECLNarrativeDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/ReceivablesandCurrentExpectedCreditLossesCECLNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_47d34c29-80fc-484a-9d32-1ac3b2afa134" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_3f6cbea5-b9e8-4a03-a926-28a7094fcb18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_47d34c29-80fc-484a-9d32-1ac3b2afa134" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_3f6cbea5-b9e8-4a03-a926-28a7094fcb18" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_713dbd7a-ff52-416f-b290-96550d8b5ef4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_3f6cbea5-b9e8-4a03-a926-28a7094fcb18" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_713dbd7a-ff52-416f-b290-96550d8b5ef4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_713dbd7a-ff52-416f-b290-96550d8b5ef4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_713dbd7a-ff52-416f-b290-96550d8b5ef4" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_713dbd7a-ff52-416f-b290-96550d8b5ef4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_88822a68-4917-4843-b99b-b92a7e3edb24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_713dbd7a-ff52-416f-b290-96550d8b5ef4" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_88822a68-4917-4843-b99b-b92a7e3edb24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_NotesReceivablePortfolioSegmentMember_0c42e137-e444-4ff0-9064-ffd597664610" xlink:href="din-20250630.xsd#din_NotesReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_88822a68-4917-4843-b99b-b92a7e3edb24" xlink:to="loc_din_NotesReceivablePortfolioSegmentMember_0c42e137-e444-4ff0-9064-ffd597664610" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_EquipmentLeasesReceivablePortfolioSegmentMember_17bef46b-197f-4893-acc6-52e1db714f05" xlink:href="din-20250630.xsd#din_EquipmentLeasesReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_88822a68-4917-4843-b99b-b92a7e3edb24" xlink:to="loc_din_EquipmentLeasesReceivablePortfolioSegmentMember_17bef46b-197f-4893-acc6-52e1db714f05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RealEstateLeaseReceivablePortfolioSegmentMember_c64dc95b-2c1b-41ba-8296-ee38ecdad44f" xlink:href="din-20250630.xsd#din_RealEstateLeaseReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_88822a68-4917-4843-b99b-b92a7e3edb24" xlink:to="loc_din_RealEstateLeaseReceivablePortfolioSegmentMember_c64dc95b-2c1b-41ba-8296-ee38ecdad44f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_ff4db72d-3d69-46a5-82da-6da154295bc2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_3f6cbea5-b9e8-4a03-a926-28a7094fcb18" xlink:to="loc_dei_LegalEntityAxis_ff4db72d-3d69-46a5-82da-6da154295bc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ff4db72d-3d69-46a5-82da-6da154295bc2_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_ff4db72d-3d69-46a5-82da-6da154295bc2" xlink:to="loc_dei_EntityDomain_ff4db72d-3d69-46a5-82da-6da154295bc2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_8fdfa631-00c2-4592-af28-bfa0b8f130c2" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_ff4db72d-3d69-46a5-82da-6da154295bc2" xlink:to="loc_dei_EntityDomain_8fdfa631-00c2-4592-af28-bfa0b8f130c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_ApplebeesMember_d28350ee-f7e0-4bcd-97f1-b327b23baed0" xlink:href="din-20250630.xsd#din_ApplebeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_8fdfa631-00c2-4592-af28-bfa0b8f130c2" xlink:to="loc_din_ApplebeesMember_d28350ee-f7e0-4bcd-97f1-b327b23baed0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_6a4725ad-bb5f-460c-88e6-50a4fc1132be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_47d34c29-80fc-484a-9d32-1ac3b2afa134" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_6a4725ad-bb5f-460c-88e6-50a4fc1132be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndFinancingReceivableAllowanceForCreditLoss_0a875d60-9014-4422-b277-476f9a9c4a99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsAndFinancingReceivableAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_47d34c29-80fc-484a-9d32-1ac3b2afa134" xlink:to="loc_us-gaap_AccountsAndFinancingReceivableAllowanceForCreditLoss_0a875d60-9014-4422-b277-476f9a9c4a99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_bb4b91ae-7e42-49ff-aa1b-a995a00b7a55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_47d34c29-80fc-484a-9d32-1ac3b2afa134" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_bb4b91ae-7e42-49ff-aa1b-a995a00b7a55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfPropertiesSubjectToGroundLeases_5aaf8bc5-7b1c-4704-ade1-5fe7c27282a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfPropertiesSubjectToGroundLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_47d34c29-80fc-484a-9d32-1ac3b2afa134" xlink:to="loc_us-gaap_NumberOfPropertiesSubjectToGroundLeases_5aaf8bc5-7b1c-4704-ade1-5fe7c27282a0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_e7a0a928-4324-4273-ac99-5937976f3171" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_47d34c29-80fc-484a-9d32-1ac3b2afa134" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_e7a0a928-4324-4273-ac99-5937976f3171" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/ReceivablesandCurrentExpectedCreditLossesCECLComponentsofReceivablesDetails" xlink:type="simple" xlink:href="din-20250630.xsd#ReceivablesandCurrentExpectedCreditLossesCECLComponentsofReceivablesDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/ReceivablesandCurrentExpectedCreditLossesCECLComponentsofReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_586ed968-8adf-45b1-8892-d8e2e3d09a68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_98d7faa7-a8e9-4b0c-ab65-0063d6664230" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_586ed968-8adf-45b1-8892-d8e2e3d09a68" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_98d7faa7-a8e9-4b0c-ab65-0063d6664230" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_541b8833-8915-4a8f-bdf8-43845900aaaf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_98d7faa7-a8e9-4b0c-ab65-0063d6664230" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_541b8833-8915-4a8f-bdf8-43845900aaaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_541b8833-8915-4a8f-bdf8-43845900aaaf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_541b8833-8915-4a8f-bdf8-43845900aaaf" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_541b8833-8915-4a8f-bdf8-43845900aaaf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_397e9bd7-4bb5-41d8-b31c-b67dc68ff775" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_541b8833-8915-4a8f-bdf8-43845900aaaf" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_397e9bd7-4bb5-41d8-b31c-b67dc68ff775" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_EquipmentLeasesReceivablePortfolioSegmentMember_23726436-cff5-4259-bf3b-207c20096aac" xlink:href="din-20250630.xsd#din_EquipmentLeasesReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_397e9bd7-4bb5-41d8-b31c-b67dc68ff775" xlink:to="loc_din_EquipmentLeasesReceivablePortfolioSegmentMember_23726436-cff5-4259-bf3b-207c20096aac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RealEstateLeaseReceivablePortfolioSegmentMember_45b1a1ba-ad00-4696-a895-a2c127225e31" xlink:href="din-20250630.xsd#din_RealEstateLeaseReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_397e9bd7-4bb5-41d8-b31c-b67dc68ff775" xlink:to="loc_din_RealEstateLeaseReceivablePortfolioSegmentMember_45b1a1ba-ad00-4696-a895-a2c127225e31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_OtherReceivablesMember_42b7cf68-c977-42aa-818e-5196942ee440" xlink:href="din-20250630.xsd#din_OtherReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_397e9bd7-4bb5-41d8-b31c-b67dc68ff775" xlink:to="loc_din_OtherReceivablesMember_42b7cf68-c977-42aa-818e-5196942ee440" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_586ed968-8adf-45b1-8892-d8e2e3d09a68" xlink:to="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableGrossCurrent_0a99aec6-863a-4dc2-a198-d580086ceb56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableGrossCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:to="loc_us-gaap_AccountsReceivableGrossCurrent_0a99aec6-863a-4dc2-a198-d580086ceb56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_GiftCardReceivable_0209d428-0049-4d4a-a7e4-1509564a4ec5" xlink:href="din-20250630.xsd#din_GiftCardReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:to="loc_din_GiftCardReceivable_0209d428-0049-4d4a-a7e4-1509564a4ec5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_NotesReceivable_01f6e98e-0805-416d-9b98-b0539900aa2a" xlink:href="din-20250630.xsd#din_NotesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:to="loc_din_NotesReceivable_01f6e98e-0805-416d-9b98-b0539900aa2a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_47ea89ad-ef2c-428e-ba22-7e92b1ecab62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:to="loc_us-gaap_NotesReceivableGross_47ea89ad-ef2c-428e-ba22-7e92b1ecab62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_AccountsAndFinancingReceivableBeforeAllowanceForCreditLoss_c14b575e-843c-44f0-9e9b-3b6e727d345f" xlink:href="din-20250630.xsd#din_AccountsAndFinancingReceivableBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:to="loc_din_AccountsAndFinancingReceivableBeforeAllowanceForCreditLoss_c14b575e-843c-44f0-9e9b-3b6e727d345f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables_7e3ed122-f6c0-4789-afe3-6ffd334a94c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables_7e3ed122-f6c0-4789-afe3-6ffd334a94c6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsAndNotesReceivableNet_e02095f9-ee15-4fca-ad24-7a0270b8f19e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsAndNotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:to="loc_us-gaap_AccountsAndNotesReceivableNet_e02095f9-ee15-4fca-ad24-7a0270b8f19e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableNetCurrent_1375aea0-b34a-4350-8461-c09edb22fb89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:to="loc_us-gaap_AccountsNotesAndLoansReceivableNetCurrent_1375aea0-b34a-4350-8461-c09edb22fb89" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent_a35152d0-9bce-4e58-b54e-e8e723ae591f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableClassifiedAbstract_2c0af90d-f151-44fb-b155-956141c6f07f" xlink:to="loc_us-gaap_LongTermAccountsNotesAndLoansReceivableNetNoncurrent_a35152d0-9bce-4e58-b54e-e8e723ae591f" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/ReceivablesandCurrentExpectedCreditLossesCECLChangesintheAllowanceforCreditLossesDetails" xlink:type="simple" xlink:href="din-20250630.xsd#ReceivablesandCurrentExpectedCreditLossesCECLChangesintheAllowanceforCreditLossesDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/ReceivablesandCurrentExpectedCreditLossesCECLChangesintheAllowanceforCreditLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5f23ed98-323c-41d9-810f-e9410ad01fb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_a1cacb59-f193-4ac5-b794-4510ffd3393d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5f23ed98-323c-41d9-810f-e9410ad01fb8" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_a1cacb59-f193-4ac5-b794-4510ffd3393d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_dc26cbe8-76ab-4c33-96ca-5a1c442c9195" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_a1cacb59-f193-4ac5-b794-4510ffd3393d" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_dc26cbe8-76ab-4c33-96ca-5a1c442c9195" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_dc26cbe8-76ab-4c33-96ca-5a1c442c9195_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_dc26cbe8-76ab-4c33-96ca-5a1c442c9195" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_dc26cbe8-76ab-4c33-96ca-5a1c442c9195_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6574cafa-61f5-4aa3-ba9d-f9ed0c895a88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_dc26cbe8-76ab-4c33-96ca-5a1c442c9195" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6574cafa-61f5-4aa3-ba9d-f9ed0c895a88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_AccountsReceivablePortfolioSegmentMember_11d55370-3e43-4f63-8dc9-3b16d73caf23" xlink:href="din-20250630.xsd#din_AccountsReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6574cafa-61f5-4aa3-ba9d-f9ed0c895a88" xlink:to="loc_din_AccountsReceivablePortfolioSegmentMember_11d55370-3e43-4f63-8dc9-3b16d73caf23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_NotesReceivableCurrentPortfolioSegmentMember_a3c7c106-e5fa-4d0d-9bde-a2401a1c181e" xlink:href="din-20250630.xsd#din_NotesReceivableCurrentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6574cafa-61f5-4aa3-ba9d-f9ed0c895a88" xlink:to="loc_din_NotesReceivableCurrentPortfolioSegmentMember_a3c7c106-e5fa-4d0d-9bde-a2401a1c181e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_NotesReceivableNoncurrentPortfolioSegmentMember_1c0f9173-7b0e-489d-9ec9-21599a7fcfac" xlink:href="din-20250630.xsd#din_NotesReceivableNoncurrentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6574cafa-61f5-4aa3-ba9d-f9ed0c895a88" xlink:to="loc_din_NotesReceivableNoncurrentPortfolioSegmentMember_1c0f9173-7b0e-489d-9ec9-21599a7fcfac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RealEstateLeaseReceivablePortfolioSegmentMember_7351d6d4-b9c4-4f96-aa0c-ff87ff0a56a8" xlink:href="din-20250630.xsd#din_RealEstateLeaseReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6574cafa-61f5-4aa3-ba9d-f9ed0c895a88" xlink:to="loc_din_RealEstateLeaseReceivablePortfolioSegmentMember_7351d6d4-b9c4-4f96-aa0c-ff87ff0a56a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_EquipmentLeasesReceivablePortfolioSegmentMember_598eebd7-7573-4f87-bd70-6dbdcbc357de" xlink:href="din-20250630.xsd#din_EquipmentLeasesReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6574cafa-61f5-4aa3-ba9d-f9ed0c895a88" xlink:to="loc_din_EquipmentLeasesReceivablePortfolioSegmentMember_598eebd7-7573-4f87-bd70-6dbdcbc357de" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_OtherPortfolioSegmentMember_e95e6975-5b66-40df-9c50-13c5d234ae1b" xlink:href="din-20250630.xsd#din_OtherPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_6574cafa-61f5-4aa3-ba9d-f9ed0c895a88" xlink:to="loc_din_OtherPortfolioSegmentMember_e95e6975-5b66-40df-9c50-13c5d234ae1b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_876f2550-c1ea-4aa1-bfe8-fb2e31879fd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5f23ed98-323c-41d9-810f-e9410ad01fb8" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_876f2550-c1ea-4aa1-bfe8-fb2e31879fd9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_42310ad8-14c3-4971-b3cc-74a4fec73913" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_876f2550-c1ea-4aa1-bfe8-fb2e31879fd9" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_42310ad8-14c3-4971-b3cc-74a4fec73913" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_027aca68-1209-4a36-8869-912821c20cd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_876f2550-c1ea-4aa1-bfe8-fb2e31879fd9" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_027aca68-1209-4a36-8869-912821c20cd2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FinancingReceivableAllowanceforCreditLossAdvertisingProvisionAdjustment_7f2f3051-35fb-40cd-bd9a-390445aa5166" xlink:href="din-20250630.xsd#din_FinancingReceivableAllowanceforCreditLossAdvertisingProvisionAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_876f2550-c1ea-4aa1-bfe8-fb2e31879fd9" xlink:to="loc_din_FinancingReceivableAllowanceforCreditLossAdvertisingProvisionAdjustment_7f2f3051-35fb-40cd-bd9a-390445aa5166" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_971bdecf-026f-45cc-9c8b-dbf6cab4d70b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_876f2550-c1ea-4aa1-bfe8-fb2e31879fd9" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs_971bdecf-026f-45cc-9c8b-dbf6cab4d70b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_7aba3d3e-af33-4881-b929-1cd06fea3785" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/ReceivablesandCurrentExpectedCreditLossesCECLYearofOriginationofFinancingReceivablesDetails" xlink:type="simple" xlink:href="din-20250630.xsd#ReceivablesandCurrentExpectedCreditLossesCECLYearofOriginationofFinancingReceivablesDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/ReceivablesandCurrentExpectedCreditLossesCECLYearofOriginationofFinancingReceivablesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ce8ac740-1fd5-48eb-abde-7be9f90fadd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_ec4fa2fe-e2c7-42d8-a055-2a94583a76d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ce8ac740-1fd5-48eb-abde-7be9f90fadd1" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_ec4fa2fe-e2c7-42d8-a055-2a94583a76d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_35a51747-a6fd-42f6-9792-49fbc0577540" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_ec4fa2fe-e2c7-42d8-a055-2a94583a76d1" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_35a51747-a6fd-42f6-9792-49fbc0577540" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_35a51747-a6fd-42f6-9792-49fbc0577540_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_35a51747-a6fd-42f6-9792-49fbc0577540" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_35a51747-a6fd-42f6-9792-49fbc0577540_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ffd93c02-7b34-4137-b4ac-803890e8866b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_35a51747-a6fd-42f6-9792-49fbc0577540" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ffd93c02-7b34-4137-b4ac-803890e8866b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_NotesReceivablePortfolioSegmentsLeaseReceivablePortfolioSegmentAndEquipmentNotesPortfolioSegmentMember_398c40bc-bdd2-41d5-82ca-524e77a2fc4f" xlink:href="din-20250630.xsd#din_NotesReceivablePortfolioSegmentsLeaseReceivablePortfolioSegmentAndEquipmentNotesPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_ffd93c02-7b34-4137-b4ac-803890e8866b" xlink:to="loc_din_NotesReceivablePortfolioSegmentsLeaseReceivablePortfolioSegmentAndEquipmentNotesPortfolioSegmentMember_398c40bc-bdd2-41d5-82ca-524e77a2fc4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_NotesReceivableCurrentAndNoncurrentPortfolioSegmentMember_71ee5696-bec2-49c9-b799-69b69dbe7cce" xlink:href="din-20250630.xsd#din_NotesReceivableCurrentAndNoncurrentPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_din_NotesReceivablePortfolioSegmentsLeaseReceivablePortfolioSegmentAndEquipmentNotesPortfolioSegmentMember_398c40bc-bdd2-41d5-82ca-524e77a2fc4f" xlink:to="loc_din_NotesReceivableCurrentAndNoncurrentPortfolioSegmentMember_71ee5696-bec2-49c9-b799-69b69dbe7cce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RealEstateLeaseReceivablePortfolioSegmentMember_050260b0-cb00-4e10-959e-96d4cddb4dee" xlink:href="din-20250630.xsd#din_RealEstateLeaseReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_din_NotesReceivablePortfolioSegmentsLeaseReceivablePortfolioSegmentAndEquipmentNotesPortfolioSegmentMember_398c40bc-bdd2-41d5-82ca-524e77a2fc4f" xlink:to="loc_din_RealEstateLeaseReceivablePortfolioSegmentMember_050260b0-cb00-4e10-959e-96d4cddb4dee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_EquipmentLeasesReceivablePortfolioSegmentMember_249afed5-b4a6-41e6-8025-83c6e2ea24e0" xlink:href="din-20250630.xsd#din_EquipmentLeasesReceivablePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_din_NotesReceivablePortfolioSegmentsLeaseReceivablePortfolioSegmentAndEquipmentNotesPortfolioSegmentMember_398c40bc-bdd2-41d5-82ca-524e77a2fc4f" xlink:to="loc_din_EquipmentLeasesReceivablePortfolioSegmentMember_249afed5-b4a6-41e6-8025-83c6e2ea24e0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_eb7f18ae-ab07-44af-b2f2-3d39980d39b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ce8ac740-1fd5-48eb-abde-7be9f90fadd1" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear_eb7f18ae-ab07-44af-b2f2-3d39980d39b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_289fb8e4-4287-4273-908a-617c3fc4b474" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ce8ac740-1fd5-48eb-abde-7be9f90fadd1" xlink:to="loc_us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear_289fb8e4-4287-4273-908a-617c3fc4b474" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_b8c48534-f5a7-476c-af42-5ea54d2c388b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ce8ac740-1fd5-48eb-abde-7be9f90fadd1" xlink:to="loc_us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear_b8c48534-f5a7-476c-af42-5ea54d2c388b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_febe8b20-1931-4363-b7c4-636eb9f10f7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ce8ac740-1fd5-48eb-abde-7be9f90fadd1" xlink:to="loc_us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear_febe8b20-1931-4363-b7c4-636eb9f10f7f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_0667bae5-285d-4de5-9894-11ed36085079" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ce8ac740-1fd5-48eb-abde-7be9f90fadd1" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear_0667bae5-285d-4de5-9894-11ed36085079" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_0f5e4110-37f1-4f16-af00-9915e7765088" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ce8ac740-1fd5-48eb-abde-7be9f90fadd1" xlink:to="loc_us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear_0f5e4110-37f1-4f16-af00-9915e7765088" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_5f75d51e-36ea-42d3-a325-62ec069228cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_ce8ac740-1fd5-48eb-abde-7be9f90fadd1" xlink:to="loc_us-gaap_NotesReceivableGross_5f75d51e-36ea-42d3-a325-62ec069228cb" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="din-20250630.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_ab7f8d7a-52f1-4b57-bd28-c05c421f63c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_ab7f8d7a-52f1-4b57-bd28-c05c421f63c0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_a96ccd51-7fd5-4ef1-a459-e0f2e6d1cb11" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_ab7f8d7a-52f1-4b57-bd28-c05c421f63c0" xlink:to="loc_dei_LegalEntityAxis_a96ccd51-7fd5-4ef1-a459-e0f2e6d1cb11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_a96ccd51-7fd5-4ef1-a459-e0f2e6d1cb11_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_a96ccd51-7fd5-4ef1-a459-e0f2e6d1cb11" xlink:to="loc_dei_EntityDomain_a96ccd51-7fd5-4ef1-a459-e0f2e6d1cb11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c9a5b00e-c60f-4936-afd6-417b8d680a6a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_a96ccd51-7fd5-4ef1-a459-e0f2e6d1cb11" xlink:to="loc_dei_EntityDomain_c9a5b00e-c60f-4936-afd6-417b8d680a6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_IhopMember_1ebe8bde-e07e-4656-8867-89f1049cd772" xlink:href="din-20250630.xsd#din_IhopMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_c9a5b00e-c60f-4936-afd6-417b8d680a6a" xlink:to="loc_din_IhopMember_1ebe8bde-e07e-4656-8867-89f1049cd772" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_ApplebeesMember_f223806a-5766-4654-abbc-796eab4089ee" xlink:href="din-20250630.xsd#din_ApplebeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_c9a5b00e-c60f-4936-afd6-417b8d680a6a" xlink:to="loc_din_ApplebeesMember_f223806a-5766-4654-abbc-796eab4089ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FuzzysMember_abf853d3-514a-4350-ab53-117c69c975e8" xlink:href="din-20250630.xsd#din_FuzzysMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_c9a5b00e-c60f-4936-afd6-417b8d680a6a" xlink:to="loc_din_FuzzysMember_abf853d3-514a-4350-ab53-117c69c975e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_6bc7565e-c4f5-4469-8a88-cbceac21d8a1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_ab7f8d7a-52f1-4b57-bd28-c05c421f63c0" xlink:to="loc_srt_RangeAxis_6bc7565e-c4f5-4469-8a88-cbceac21d8a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6bc7565e-c4f5-4469-8a88-cbceac21d8a1_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_6bc7565e-c4f5-4469-8a88-cbceac21d8a1" xlink:to="loc_srt_RangeMember_6bc7565e-c4f5-4469-8a88-cbceac21d8a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_ba34f12c-b443-4df0-8194-740ce0cf90ac" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_6bc7565e-c4f5-4469-8a88-cbceac21d8a1" xlink:to="loc_srt_RangeMember_ba34f12c-b443-4df0-8194-740ce0cf90ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_62788980-3148-4cb5-9e75-83a5f5fb9ae2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ba34f12c-b443-4df0-8194-740ce0cf90ac" xlink:to="loc_srt_MinimumMember_62788980-3148-4cb5-9e75-83a5f5fb9ae2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6c352df9-39db-4c32-8b95-17f2c91171e7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_ba34f12c-b443-4df0-8194-740ce0cf90ac" xlink:to="loc_srt_MaximumMember_6c352df9-39db-4c32-8b95-17f2c91171e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_LesseeNumberOfFranchiseeOperatedRestaurants_5819445a-9ab8-4129-8bbf-e43d78ae6ed5" xlink:href="din-20250630.xsd#din_LesseeNumberOfFranchiseeOperatedRestaurants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_din_LesseeNumberOfFranchiseeOperatedRestaurants_5819445a-9ab8-4129-8bbf-e43d78ae6ed5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_LessorNumberOfPropertiesLeased_c279812a-3fcd-4b22-a631-1b7117eb98ff" xlink:href="din-20250630.xsd#din_LessorNumberOfPropertiesLeased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_din_LessorNumberOfPropertiesLeased_c279812a-3fcd-4b22-a631-1b7117eb98ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_LesseeNumberOfCompanyOperatedRestaurants_d0dfbcdd-e494-495c-80dd-28ed2f3be02f" xlink:href="din-20250630.xsd#din_LesseeNumberOfCompanyOperatedRestaurants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_din_LesseeNumberOfCompanyOperatedRestaurants_d0dfbcdd-e494-495c-80dd-28ed2f3be02f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_e07fc662-548b-48ec-b9af-e7a005a699bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_e07fc662-548b-48ec-b9af-e7a005a699bd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_97d8faf6-3ca0-4813-903c-54a4955c3587" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_us-gaap_LesseeOperatingLeaseRenewalTerm_97d8faf6-3ca0-4813-903c-54a4955c3587" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_LessorNumberOfLeasesRequiringAdditionalRentPaymentsBasedOnAPercentageOfRestaurantSales_4f01f07e-9e8f-4250-a342-a1614d4f37ae" xlink:href="din-20250630.xsd#din_LessorNumberOfLeasesRequiringAdditionalRentPaymentsBasedOnAPercentageOfRestaurantSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_din_LessorNumberOfLeasesRequiringAdditionalRentPaymentsBasedOnAPercentageOfRestaurantSales_4f01f07e-9e8f-4250-a342-a1614d4f37ae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_LesseeNumberOfLeasesRequiringAdditionalRentPaymentsBasedOnAPercentageOfRestaurantSales_d9d72fd5-0f67-4a18-bf72-10ffa8ff52bf" xlink:href="din-20250630.xsd#din_LesseeNumberOfLeasesRequiringAdditionalRentPaymentsBasedOnAPercentageOfRestaurantSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_din_LesseeNumberOfLeasesRequiringAdditionalRentPaymentsBasedOnAPercentageOfRestaurantSales_d9d72fd5-0f67-4a18-bf72-10ffa8ff52bf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_2be811e1-4df2-4856-8cfb-d3c1ac82badd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_2be811e1-4df2-4856-8cfb-d3c1ac82badd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_7f94a4a4-6a5f-493c-8998-644a75e35937" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_7f94a4a4-6a5f-493c-8998-644a75e35937" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_adbe0287-7bd0-494e-ae97-89515bb9cec1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent_adbe0287-7bd0-494e-ae97-89515bb9cec1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_a8fdc169-ea9b-4a82-a61c-1ba6b1545056" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_f8532f40-06ac-4c4d-9a1c-a573a22c2ef0" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_a8fdc169-ea9b-4a82-a61c-1ba6b1545056" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/LongTermDebtScheduleofDebtComponentsDetails" xlink:type="simple" xlink:href="din-20250630.xsd#LongTermDebtScheduleofDebtComponentsDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/LongTermDebtScheduleofDebtComponentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_f9502c51-951a-4c23-9ff3-744150f80c6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_7f2cd2b4-0c90-44b4-a094-59e784337f94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9502c51-951a-4c23-9ff3-744150f80c6a" xlink:to="loc_us-gaap_DebtInstrumentTable_7f2cd2b4-0c90-44b4-a094-59e784337f94" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_29802d7b-e962-49c4-8f64-a665c2ead5ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_7f2cd2b4-0c90-44b4-a094-59e784337f94" xlink:to="loc_us-gaap_DebtInstrumentAxis_29802d7b-e962-49c4-8f64-a665c2ead5ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_29802d7b-e962-49c4-8f64-a665c2ead5ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_29802d7b-e962-49c4-8f64-a665c2ead5ba" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_29802d7b-e962-49c4-8f64-a665c2ead5ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3f5412b9-9ad0-479b-9bea-dee363fcd63d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_29802d7b-e962-49c4-8f64-a665c2ead5ba" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3f5412b9-9ad0-479b-9bea-dee363fcd63d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series201914.723FixedRateSeniorSecuredNotesClassA2IIMember_a5e81b33-97d5-4910-9fd1-bbb1ce5c2230" xlink:href="din-20250630.xsd#din_Series201914.723FixedRateSeniorSecuredNotesClassA2IIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3f5412b9-9ad0-479b-9bea-dee363fcd63d" xlink:to="loc_din_Series201914.723FixedRateSeniorSecuredNotesClassA2IIMember_a5e81b33-97d5-4910-9fd1-bbb1ce5c2230" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series20221VariableFundingSeniorSecuredNotesClassA1Member_02756ddd-067d-4115-a8ab-6966cd61d734" xlink:href="din-20250630.xsd#din_Series20221VariableFundingSeniorSecuredNotesClassA1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3f5412b9-9ad0-479b-9bea-dee363fcd63d" xlink:to="loc_din_Series20221VariableFundingSeniorSecuredNotesClassA1Member_02756ddd-067d-4115-a8ab-6966cd61d734" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series202317824FixedRateSeniorSecuredNotesClassA2Member_7581c603-8c32-4688-b2f5-1af98149f532" xlink:href="din-20250630.xsd#din_Series202317824FixedRateSeniorSecuredNotesClassA2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3f5412b9-9ad0-479b-9bea-dee363fcd63d" xlink:to="loc_din_Series202317824FixedRateSeniorSecuredNotesClassA2Member_7581c603-8c32-4688-b2f5-1af98149f532" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series202516.720FixedRateSeniorSecuredNotesClassA2Member_e5a4bf08-1f34-41ea-8a43-8b45eabe8361" xlink:href="din-20250630.xsd#din_Series202516.720FixedRateSeniorSecuredNotesClassA2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3f5412b9-9ad0-479b-9bea-dee363fcd63d" xlink:to="loc_din_Series202516.720FixedRateSeniorSecuredNotesClassA2Member_e5a4bf08-1f34-41ea-8a43-8b45eabe8361" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series20251VariableFundingSeniorSecuredNotesClassA1Member_fd62a2b0-c5f2-4c1a-8c92-bb078dddcb89" xlink:href="din-20250630.xsd#din_Series20251VariableFundingSeniorSecuredNotesClassA1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3f5412b9-9ad0-479b-9bea-dee363fcd63d" xlink:to="loc_din_Series20251VariableFundingSeniorSecuredNotesClassA1Member_fd62a2b0-c5f2-4c1a-8c92-bb078dddcb89" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotes_112638bc-4145-4050-98ac-c4f10a45d879" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9502c51-951a-4c23-9ff3-744150f80c6a" xlink:to="loc_us-gaap_SeniorNotes_112638bc-4145-4050-98ac-c4f10a45d879" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_4107899a-507c-46e7-be81-5bc662a5b3b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9502c51-951a-4c23-9ff3-744150f80c6a" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_4107899a-507c-46e7-be81-5bc662a5b3b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_e8a34d07-a06e-4868-ac9d-d387c1da31ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9502c51-951a-4c23-9ff3-744150f80c6a" xlink:to="loc_us-gaap_LongTermDebt_e8a34d07-a06e-4868-ac9d-d387c1da31ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_9c1a9b7f-985e-4c96-8297-d8483f2305b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9502c51-951a-4c23-9ff3-744150f80c6a" xlink:to="loc_us-gaap_LongTermDebtCurrent_9c1a9b7f-985e-4c96-8297-d8483f2305b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_3b9d326b-769b-404d-99e6-4ee15b93a4f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9502c51-951a-4c23-9ff3-744150f80c6a" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_3b9d326b-769b-404d-99e6-4ee15b93a4f0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_878d343e-f71f-400b-90ed-04ed7d44c90b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_f9502c51-951a-4c23-9ff3-744150f80c6a" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_878d343e-f71f-400b-90ed-04ed7d44c90b" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/LongTermDebtNarrativeDetails" xlink:type="simple" xlink:href="din-20250630.xsd#LongTermDebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/LongTermDebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_e557bae6-a740-4723-96e9-ef041e4aa35f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DebtInstrumentTable_e557bae6-a740-4723-96e9-ef041e4aa35f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_bd5f2316-f772-4684-81cc-fe69a6960f9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e557bae6-a740-4723-96e9-ef041e4aa35f" xlink:to="loc_us-gaap_DebtInstrumentAxis_bd5f2316-f772-4684-81cc-fe69a6960f9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_bd5f2316-f772-4684-81cc-fe69a6960f9e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_bd5f2316-f772-4684-81cc-fe69a6960f9e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_bd5f2316-f772-4684-81cc-fe69a6960f9e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_21f91c65-6ea3-4a79-859a-2f42c3c17f99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_bd5f2316-f772-4684-81cc-fe69a6960f9e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_21f91c65-6ea3-4a79-859a-2f42c3c17f99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series201914723FixedRateSeniorSecuredNotesClassA2IIAndSeries201914194FixedRateSeniorSecuredNotesClassA2IMember_18565aa4-1ff5-4616-9705-f8f79c90a3cd" xlink:href="din-20250630.xsd#din_Series201914723FixedRateSeniorSecuredNotesClassA2IIAndSeries201914194FixedRateSeniorSecuredNotesClassA2IMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_21f91c65-6ea3-4a79-859a-2f42c3c17f99" xlink:to="loc_din_Series201914723FixedRateSeniorSecuredNotesClassA2IIAndSeries201914194FixedRateSeniorSecuredNotesClassA2IMember_18565aa4-1ff5-4616-9705-f8f79c90a3cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series201914.194FixedRateSeniorSecuredNotesClassA2IMember_ed940a13-9053-4824-86fd-440be7234567" xlink:href="din-20250630.xsd#din_Series201914.194FixedRateSeniorSecuredNotesClassA2IMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_21f91c65-6ea3-4a79-859a-2f42c3c17f99" xlink:to="loc_din_Series201914.194FixedRateSeniorSecuredNotesClassA2IMember_ed940a13-9053-4824-86fd-440be7234567" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series201914.723FixedRateSeniorSecuredNotesClassA2IIMember_c3e74dcd-fe29-4822-bc28-99dbe388aa84" xlink:href="din-20250630.xsd#din_Series201914.723FixedRateSeniorSecuredNotesClassA2IIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_21f91c65-6ea3-4a79-859a-2f42c3c17f99" xlink:to="loc_din_Series201914.723FixedRateSeniorSecuredNotesClassA2IIMember_c3e74dcd-fe29-4822-bc28-99dbe388aa84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series202317824FixedRateSeniorSecuredNotesClassA2Member_bdda1b49-22d6-4bb6-b71e-88d4707b3ddc" xlink:href="din-20250630.xsd#din_Series202317824FixedRateSeniorSecuredNotesClassA2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_21f91c65-6ea3-4a79-859a-2f42c3c17f99" xlink:to="loc_din_Series202317824FixedRateSeniorSecuredNotesClassA2Member_bdda1b49-22d6-4bb6-b71e-88d4707b3ddc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series20221VariableFundingSeniorSecuredNotesClassA1Member_d94b00bf-54cb-4e88-9f4d-403be3ade0c4" xlink:href="din-20250630.xsd#din_Series20221VariableFundingSeniorSecuredNotesClassA1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_21f91c65-6ea3-4a79-859a-2f42c3c17f99" xlink:to="loc_din_Series20221VariableFundingSeniorSecuredNotesClassA1Member_d94b00bf-54cb-4e88-9f4d-403be3ade0c4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series202516.720FixedRateSeniorSecuredNotesClassA2Member_4bb570d5-c25d-45d8-b053-77063ae3a2a0" xlink:href="din-20250630.xsd#din_Series202516.720FixedRateSeniorSecuredNotesClassA2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_21f91c65-6ea3-4a79-859a-2f42c3c17f99" xlink:to="loc_din_Series202516.720FixedRateSeniorSecuredNotesClassA2Member_4bb570d5-c25d-45d8-b053-77063ae3a2a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_Series20251VariableFundingSeniorSecuredNotesClassA1Member_bf61b375-2843-4e81-846d-21d7c7984260" xlink:href="din-20250630.xsd#din_Series20251VariableFundingSeniorSecuredNotesClassA1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_21f91c65-6ea3-4a79-859a-2f42c3c17f99" xlink:to="loc_din_Series20251VariableFundingSeniorSecuredNotesClassA1Member_bf61b375-2843-4e81-846d-21d7c7984260" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_202e7348-2219-4b8f-8a4b-0ad9cdb73249" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e557bae6-a740-4723-96e9-ef041e4aa35f" xlink:to="loc_us-gaap_CreditFacilityAxis_202e7348-2219-4b8f-8a4b-0ad9cdb73249" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_202e7348-2219-4b8f-8a4b-0ad9cdb73249_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_202e7348-2219-4b8f-8a4b-0ad9cdb73249" xlink:to="loc_us-gaap_CreditFacilityDomain_202e7348-2219-4b8f-8a4b-0ad9cdb73249_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_d985d6ac-578f-4868-be6f-2e37f09fea5d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_202e7348-2219-4b8f-8a4b-0ad9cdb73249" xlink:to="loc_us-gaap_CreditFacilityDomain_d985d6ac-578f-4868-be6f-2e37f09fea5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_cb413792-d55d-451c-a0ce-d2db9f794765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_d985d6ac-578f-4868-be6f-2e37f09fea5d" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_cb413792-d55d-451c-a0ce-d2db9f794765" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_bfa053e2-4011-4eeb-9ddb-baf0a23fa783" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_d985d6ac-578f-4868-be6f-2e37f09fea5d" xlink:to="loc_us-gaap_LetterOfCreditMember_bfa053e2-4011-4eeb-9ddb-baf0a23fa783" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_f777f183-0bce-44d9-94ba-e6f2734773b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e557bae6-a740-4723-96e9-ef041e4aa35f" xlink:to="loc_us-gaap_VariableRateAxis_f777f183-0bce-44d9-94ba-e6f2734773b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_f777f183-0bce-44d9-94ba-e6f2734773b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_f777f183-0bce-44d9-94ba-e6f2734773b6" xlink:to="loc_us-gaap_VariableRateDomain_f777f183-0bce-44d9-94ba-e6f2734773b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_ad36d236-4d69-4900-be6a-4fd2e3b0fa9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_f777f183-0bce-44d9-94ba-e6f2734773b6" xlink:to="loc_us-gaap_VariableRateDomain_ad36d236-4d69-4900-be6a-4fd2e3b0fa9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_TenYearUnitedStatesTreasuryBillRateMember_bbc0f007-f3a9-462f-9c59-306067d2c5be" xlink:href="din-20250630.xsd#din_TenYearUnitedStatesTreasuryBillRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_ad36d236-4d69-4900-be6a-4fd2e3b0fa9f" xlink:to="loc_din_TenYearUnitedStatesTreasuryBillRateMember_bbc0f007-f3a9-462f-9c59-306067d2c5be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_255a6297-908f-4754-ac8d-60143d1fd0b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_ad36d236-4d69-4900-be6a-4fd2e3b0fa9f" xlink:to="loc_us-gaap_BaseRateMember_255a6297-908f-4754-ac8d-60143d1fd0b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_f811e6eb-f148-46bb-921e-15eedc801746" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_ad36d236-4d69-4900-be6a-4fd2e3b0fa9f" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_f811e6eb-f148-46bb-921e-15eedc801746" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FederalFundsRateMember_b69cfbfb-0b78-4f63-9d79-843c05f0bfac" xlink:href="din-20250630.xsd#din_FederalFundsRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_ad36d236-4d69-4900-be6a-4fd2e3b0fa9f" xlink:to="loc_din_FederalFundsRateMember_b69cfbfb-0b78-4f63-9d79-843c05f0bfac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtInstrumentNumberOfTranchesIssued_54392214-5d54-4eb7-9f7b-b4a6d046337c" xlink:href="din-20250630.xsd#din_DebtInstrumentNumberOfTranchesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtInstrumentNumberOfTranchesIssued_54392214-5d54-4eb7-9f7b-b4a6d046337c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f18445df-4802-4e8c-8f26-a058fbc32491" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_f18445df-4802-4e8c-8f26-a058fbc32491" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_16c497e2-b077-4a4c-8793-5cfc3f2a3471" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_16c497e2-b077-4a4c-8793-5cfc3f2a3471" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_72fc3b05-1ea9-4211-b10d-907d2dc9149b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_72fc3b05-1ea9-4211-b10d-907d2dc9149b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_LineOfCreditFacilityExpiredAmount_a4db96ea-ac94-438f-a66a-81b19b4f686f" xlink:href="din-20250630.xsd#din_LineOfCreditFacilityExpiredAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_LineOfCreditFacilityExpiredAmount_a4db96ea-ac94-438f-a66a-81b19b4f686f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_33b6e481-2702-4fad-990c-0dbf783228f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_33b6e481-2702-4fad-990c-0dbf783228f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_d9d9a8c8-337d-497a-af24-382a77d05d4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DebtInstrumentTerm_d9d9a8c8-337d-497a-af24-382a77d05d4e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtInstrumentAdditionalInterestOnFixedRate_3044c38e-d5fe-4842-901e-85b57f81efe9" xlink:href="din-20250630.xsd#din_DebtInstrumentAdditionalInterestOnFixedRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtInstrumentAdditionalInterestOnFixedRate_3044c38e-d5fe-4842-901e-85b57f81efe9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_4d84b897-7fae-4d6f-a7c8-852d6af0ce6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_4d84b897-7fae-4d6f-a7c8-852d6af0ce6d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtInstrumentCovenantComplianceRatioOfIndebtednessToNetCapitalMaximum_8d66d1de-185a-4985-93b3-9b6aa007fac8" xlink:href="din-20250630.xsd#din_DebtInstrumentCovenantComplianceRatioOfIndebtednessToNetCapitalMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtInstrumentCovenantComplianceRatioOfIndebtednessToNetCapitalMaximum_8d66d1de-185a-4985-93b3-9b6aa007fac8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RatioOfIndebtednessToNetCapital1_bc66826e-6b12-4631-8c03-7f2a26f031b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RatioOfIndebtednessToNetCapital1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_RatioOfIndebtednessToNetCapital1_bc66826e-6b12-4631-8c03-7f2a26f031b9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtInstrumentMakeWholePremium_470474e9-fa1b-41d5-b716-ba6cf606233f" xlink:href="din-20250630.xsd#din_DebtInstrumentMakeWholePremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtInstrumentMakeWholePremium_470474e9-fa1b-41d5-b716-ba6cf606233f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_12837861-284d-462c-a540-78bd140a0456" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_12837861-284d-462c-a540-78bd140a0456" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtInstrumentNumberOfRenewalPeriods_4354f17a-0583-4530-a87f-7801919499e6" xlink:href="din-20250630.xsd#din_DebtInstrumentNumberOfRenewalPeriods"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtInstrumentNumberOfRenewalPeriods_4354f17a-0583-4530-a87f-7801919499e6" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtInstrumentRenewalPeriod_e1ee3609-406c-4d64-bc3e-f44c8818487e" xlink:href="din-20250630.xsd#din_DebtInstrumentRenewalPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtInstrumentRenewalPeriod_e1ee3609-406c-4d64-bc3e-f44c8818487e" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtInstrumentInterestRatePercentageAfterRenewalDate_fcb9b00b-469b-499e-8f8a-9a11af5137ac" xlink:href="din-20250630.xsd#din_DebtInstrumentInterestRatePercentageAfterRenewalDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtInstrumentInterestRatePercentageAfterRenewalDate_fcb9b00b-469b-499e-8f8a-9a11af5137ac" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_ca480d2c-f566-4466-b942-fc80297808f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_ca480d2c-f566-4466-b942-fc80297808f7" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_911b47b2-115f-4c70-9015-a16cfa9aba1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_911b47b2-115f-4c70-9015-a16cfa9aba1d" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_d424f1d9-545d-4092-b93b-45a501cc4a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_d424f1d9-545d-4092-b93b-45a501cc4a6a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_a3b75c58-e592-4427-93e8-6c3c66652c28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_a3b75c58-e592-4427-93e8-6c3c66652c28" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtInstrumentRepurchaseProgramMaximumAmount_b4ba79e1-9d04-461b-b796-8298cc7ddf5a" xlink:href="din-20250630.xsd#din_DebtInstrumentRepurchaseProgramMaximumAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtInstrumentRepurchaseProgramMaximumAmount_b4ba79e1-9d04-461b-b796-8298cc7ddf5a" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtServiceCoverageRatioCashSweepingEvent_dd3e5972-d87a-4053-9410-dacc271e2eed" xlink:href="din-20250630.xsd#din_DebtServiceCoverageRatioCashSweepingEvent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtServiceCoverageRatioCashSweepingEvent_dd3e5972-d87a-4053-9410-dacc271e2eed" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtServiceCoverageRatioRapidAmortizationEvent_bde6a0d8-ffe7-4ce0-9b0d-53d038637236" xlink:href="din-20250630.xsd#din_DebtServiceCoverageRatioRapidAmortizationEvent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtServiceCoverageRatioRapidAmortizationEvent_bde6a0d8-ffe7-4ce0-9b0d-53d038637236" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_InterestOnlyDebtServiceCoverageRatioManagerTerminationEvent_d73e2e79-d09c-4118-8390-2ce6135c88ef" xlink:href="din-20250630.xsd#din_InterestOnlyDebtServiceCoverageRatioManagerTerminationEvent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_InterestOnlyDebtServiceCoverageRatioManagerTerminationEvent_d73e2e79-d09c-4118-8390-2ce6135c88ef" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_InterestOnlyDebtServiceCoverageRatioDefaultEvent_f9720d01-677b-4972-a64c-e4fefa29de2e" xlink:href="din-20250630.xsd#din_InterestOnlyDebtServiceCoverageRatioDefaultEvent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_InterestOnlyDebtServiceCoverageRatioDefaultEvent_f9720d01-677b-4972-a64c-e4fefa29de2e" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_DebtServiceCoverageRatio_08d047fd-2bb8-44b2-945e-485089ef07ac" xlink:href="din-20250630.xsd#din_DebtServiceCoverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_DebtServiceCoverageRatio_08d047fd-2bb8-44b2-945e-485089ef07ac" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_732c7275-cf60-4509-aec8-deb167fb2147" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_732c7275-cf60-4509-aec8-deb167fb2147" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_48ebd979-09fa-44c2-bc37-66f8d88cb27b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_48ebd979-09fa-44c2-bc37-66f8d88cb27b" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_219927a6-502b-4d0d-86c3-d21569bee685" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_219927a6-502b-4d0d-86c3-d21569bee685" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_d6f9320b-7843-42fa-a7d5-2f1aa459a650" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_d6f9320b-7843-42fa-a7d5-2f1aa459a650" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_7e4e4d1b-42a1-4422-8fee-d947fd31e83c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_7e4e4d1b-42a1-4422-8fee-d947fd31e83c" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_LineOfCreditFacilityNumberOfAdditionalExtensions_55be186d-1e96-47f0-9c77-4cff6e0bff98" xlink:href="din-20250630.xsd#din_LineOfCreditFacilityNumberOfAdditionalExtensions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_LineOfCreditFacilityNumberOfAdditionalExtensions_55be186d-1e96-47f0-9c77-4cff6e0bff98" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_LineOfCreditFacilityAdditionalExtensionTerm_a11a6acf-91e5-4294-b872-9bed2143f31b" xlink:href="din-20250630.xsd#din_LineOfCreditFacilityAdditionalExtensionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_din_LineOfCreditFacilityAdditionalExtensionTerm_a11a6acf-91e5-4294-b872-9bed2143f31b" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAnnualPrincipalPayment_59bba807-90e4-4975-b9a5-32bf3c10590d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAnnualPrincipalPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_cb7a6e29-f2d8-451a-a1a6-6e6c7dfc99b1" xlink:to="loc_us-gaap_DebtInstrumentAnnualPrincipalPayment_59bba807-90e4-4975-b9a5-32bf3c10590d" xlink:type="arc" order="33"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/StockholdersDeficitNarrativeDetails" xlink:type="simple" xlink:href="din-20250630.xsd#StockholdersDeficitNarrativeDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/StockholdersDeficitNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_f5eec732-2532-455b-87ff-7f1f08c59b4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_f5eec732-2532-455b-87ff-7f1f08c59b4c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_f07f631b-f66d-4253-bca5-efb62dbf2fe1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f5eec732-2532-455b-87ff-7f1f08c59b4c" xlink:to="loc_srt_ShareRepurchaseProgramAxis_f07f631b-f66d-4253-bca5-efb62dbf2fe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_f07f631b-f66d-4253-bca5-efb62dbf2fe1_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_f07f631b-f66d-4253-bca5-efb62dbf2fe1" xlink:to="loc_srt_ShareRepurchaseProgramDomain_f07f631b-f66d-4253-bca5-efb62dbf2fe1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_7add7b81-c500-4ad6-9a39-a9f4ead1ec9f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_f07f631b-f66d-4253-bca5-efb62dbf2fe1" xlink:to="loc_srt_ShareRepurchaseProgramDomain_7add7b81-c500-4ad6-9a39-a9f4ead1ec9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_TwoThousandTwentyTwoRepurchaseProgramMember_ff0298be-cc88-4c68-a762-972573f5569c" xlink:href="din-20250630.xsd#din_TwoThousandTwentyTwoRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_7add7b81-c500-4ad6-9a39-a9f4ead1ec9f" xlink:to="loc_din_TwoThousandTwentyTwoRepurchaseProgramMember_ff0298be-cc88-4c68-a762-972573f5569c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_1c8994e5-c727-4e05-a98a-dc89ae3f8d1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_f5eec732-2532-455b-87ff-7f1f08c59b4c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_1c8994e5-c727-4e05-a98a-dc89ae3f8d1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_1c8994e5-c727-4e05-a98a-dc89ae3f8d1a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1c8994e5-c727-4e05-a98a-dc89ae3f8d1a" xlink:to="loc_us-gaap_EquityComponentDomain_1c8994e5-c727-4e05-a98a-dc89ae3f8d1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_7284206f-f696-4c55-9776-1b330d5269f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_1c8994e5-c727-4e05-a98a-dc89ae3f8d1a" xlink:to="loc_us-gaap_EquityComponentDomain_7284206f-f696-4c55-9776-1b330d5269f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_ce72d501-f039-4407-be46-9b58c0afba09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7284206f-f696-4c55-9776-1b330d5269f2" xlink:to="loc_us-gaap_CommonStockMember_ce72d501-f039-4407-be46-9b58c0afba09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_17168ddc-ed47-41f2-9d99-87fcb46413d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_7284206f-f696-4c55-9776-1b330d5269f2" xlink:to="loc_us-gaap_TreasuryStockCommonMember_17168ddc-ed47-41f2-9d99-87fcb46413d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividends_83767efa-db02-4e68-85a9-80543b13a812" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:to="loc_us-gaap_PaymentsOfDividends_83767efa-db02-4e68-85a9-80543b13a812" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_07bc9999-3aa6-4e3b-ae20-4b0f6a855015" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_07bc9999-3aa6-4e3b-ae20-4b0f6a855015" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_e3a74730-851f-4f9f-9f51-2c1a63516fd9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_e3a74730-851f-4f9f-9f51-2c1a63516fd9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_f4b52468-6e02-4ecc-ac07-095784ba5b24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_f4b52468-6e02-4ecc-ac07-095784ba5b24" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_679fc1e0-f29e-4e20-9b5a-1788133efc7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_679fc1e0-f29e-4e20-9b5a-1788133efc7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_500e4951-34b6-46ab-86e9-d82ff17d186f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_500e4951-34b6-46ab-86e9-d82ff17d186f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued_d3e6e22a-08a2-4ac2-95bf-63081d5d24db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued_d3e6e22a-08a2-4ac2-95bf-63081d5d24db" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_945c6253-8105-4305-b089-0ea2bb1ce22e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_f2666a08-727b-414a-ae61-bdf9a408fe28" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued_945c6253-8105-4305-b089-0ea2bb1ce22e" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="din-20250630.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a1b66a1f-68ac-4029-a9fb-b590660ad73e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1e421fbb-c8c3-42da-96e7-d71690a04cb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a1b66a1f-68ac-4029-a9fb-b590660ad73e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1e421fbb-c8c3-42da-96e7-d71690a04cb2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ca702bb0-5d77-49b5-b64a-8d67eb402226" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1e421fbb-c8c3-42da-96e7-d71690a04cb2" xlink:to="loc_us-gaap_AwardTypeAxis_ca702bb0-5d77-49b5-b64a-8d67eb402226" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ca702bb0-5d77-49b5-b64a-8d67eb402226_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ca702bb0-5d77-49b5-b64a-8d67eb402226" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ca702bb0-5d77-49b5-b64a-8d67eb402226_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7bfb08bc-0482-4ffb-89f1-f7ddcd2958fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ca702bb0-5d77-49b5-b64a-8d67eb402226" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7bfb08bc-0482-4ffb-89f1-f7ddcd2958fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RestrictedStockandRestrictedStockUnitsMember_eae08c71-2b67-4be4-bee5-fff355bbd2d9" xlink:href="din-20250630.xsd#din_RestrictedStockandRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7bfb08bc-0482-4ffb-89f1-f7ddcd2958fe" xlink:to="loc_din_RestrictedStockandRestrictedStockUnitsMember_eae08c71-2b67-4be4-bee5-fff355bbd2d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_000b2c23-6134-44c9-be5e-d4e7397574d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7bfb08bc-0482-4ffb-89f1-f7ddcd2958fe" xlink:to="loc_us-gaap_EmployeeStockOptionMember_000b2c23-6134-44c9-be5e-d4e7397574d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_LongTermIncentivePlanAwardsMember_689c1e1b-297d-461a-a7b6-64f57564f192" xlink:href="din-20250630.xsd#din_LongTermIncentivePlanAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7bfb08bc-0482-4ffb-89f1-f7ddcd2958fe" xlink:to="loc_din_LongTermIncentivePlanAwardsMember_689c1e1b-297d-461a-a7b6-64f57564f192" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_A2023And2024LongTermIncentivePlanAwardsMember_952033a1-6aa5-4460-85d1-ff17a900edee" xlink:href="din-20250630.xsd#din_A2023And2024LongTermIncentivePlanAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_din_LongTermIncentivePlanAwardsMember_689c1e1b-297d-461a-a7b6-64f57564f192" xlink:to="loc_din_A2023And2024LongTermIncentivePlanAwardsMember_952033a1-6aa5-4460-85d1-ff17a900edee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_A2025LongTermIncentivePlanAwardsMember_623e948d-9431-41ad-a0e6-540fb4fd2ecf" xlink:href="din-20250630.xsd#din_A2025LongTermIncentivePlanAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_din_LongTermIncentivePlanAwardsMember_689c1e1b-297d-461a-a7b6-64f57564f192" xlink:to="loc_din_A2025LongTermIncentivePlanAwardsMember_623e948d-9431-41ad-a0e6-540fb4fd2ecf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b647ae9d-04d9-4f02-ab16-2fe6311bb21e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1e421fbb-c8c3-42da-96e7-d71690a04cb2" xlink:to="loc_srt_RangeAxis_b647ae9d-04d9-4f02-ab16-2fe6311bb21e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b647ae9d-04d9-4f02-ab16-2fe6311bb21e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_b647ae9d-04d9-4f02-ab16-2fe6311bb21e" xlink:to="loc_srt_RangeMember_b647ae9d-04d9-4f02-ab16-2fe6311bb21e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9f66517c-886f-4d78-8953-9183243304cb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_b647ae9d-04d9-4f02-ab16-2fe6311bb21e" xlink:to="loc_srt_RangeMember_9f66517c-886f-4d78-8953-9183243304cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_f2ba74d4-8967-48fc-8e3c-008da58a9074" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_9f66517c-886f-4d78-8953-9183243304cb" xlink:to="loc_srt_MinimumMember_f2ba74d4-8967-48fc-8e3c-008da58a9074" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_33dfdf32-d558-4242-b859-86cc3b7c001b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_9f66517c-886f-4d78-8953-9183243304cb" xlink:to="loc_srt_MaximumMember_33dfdf32-d558-4242-b859-86cc3b7c001b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_701bec7e-4ec3-4595-a4cb-08fbd21e03b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a1b66a1f-68ac-4029-a9fb-b590660ad73e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_701bec7e-4ec3-4595-a4cb-08fbd21e03b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_b26235cb-8082-45b2-b0a7-6f0bdcd97f08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a1b66a1f-68ac-4029-a9fb-b590660ad73e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_b26235cb-8082-45b2-b0a7-6f0bdcd97f08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_4445fa50-ad25-41a3-a249-70a408722dda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a1b66a1f-68ac-4029-a9fb-b590660ad73e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_4445fa50-ad25-41a3-a249-70a408722dda" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_ShareBasedCompensationMultiplierForTargetAwardBasedOnTotalShareholderReturnOnCommonStock_29924f3d-09b7-4210-809a-562f946bc324" xlink:href="din-20250630.xsd#din_ShareBasedCompensationMultiplierForTargetAwardBasedOnTotalShareholderReturnOnCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a1b66a1f-68ac-4029-a9fb-b590660ad73e" xlink:to="loc_din_ShareBasedCompensationMultiplierForTargetAwardBasedOnTotalShareholderReturnOnCommonStock_29924f3d-09b7-4210-809a-562f946bc324" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_e4981eae-7599-4b71-8532-082fbbada2d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a1b66a1f-68ac-4029-a9fb-b590660ad73e" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_e4981eae-7599-4b71-8532-082fbbada2d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_e3a39cb9-b1b6-41d2-afd2-fd2af3f4b9fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a1b66a1f-68ac-4029-a9fb-b590660ad73e" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_e3a39cb9-b1b6-41d2-afd2-fd2af3f4b9fd" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/StockBasedCompensationRestrictedStockActivityDetails" xlink:type="simple" xlink:href="din-20250630.xsd#StockBasedCompensationRestrictedStockActivityDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/StockBasedCompensationRestrictedStockActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb76c667-4cae-4b38-b3c9-2db48dd5094c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1f7f95ea-6112-4ed6-9021-12c606f9f6d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb76c667-4cae-4b38-b3c9-2db48dd5094c" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1f7f95ea-6112-4ed6-9021-12c606f9f6d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_daf8cf1a-7359-4822-b270-f09f61de88d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1f7f95ea-6112-4ed6-9021-12c606f9f6d4" xlink:to="loc_us-gaap_AwardTypeAxis_daf8cf1a-7359-4822-b270-f09f61de88d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_daf8cf1a-7359-4822-b270-f09f61de88d7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_daf8cf1a-7359-4822-b270-f09f61de88d7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_daf8cf1a-7359-4822-b270-f09f61de88d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_85d4fc17-5fb0-4aaf-a6e2-3937d2325370" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_daf8cf1a-7359-4822-b270-f09f61de88d7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_85d4fc17-5fb0-4aaf-a6e2-3937d2325370" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_71316631-8c5e-4664-9b16-10f4905ebf6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_85d4fc17-5fb0-4aaf-a6e2-3937d2325370" xlink:to="loc_us-gaap_RestrictedStockMember_71316631-8c5e-4664-9b16-10f4905ebf6a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_6f72f719-c763-40eb-83e4-e9cb31f35d1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_85d4fc17-5fb0-4aaf-a6e2-3937d2325370" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_6f72f719-c763-40eb-83e4-e9cb31f35d1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_58c12722-5419-4471-a9a7-8b43e8cd05ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb76c667-4cae-4b38-b3c9-2db48dd5094c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_58c12722-5419-4471-a9a7-8b43e8cd05ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_a2e509ef-1d6a-4366-8aac-6eb6ec8d4934" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_58c12722-5419-4471-a9a7-8b43e8cd05ec" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_a2e509ef-1d6a-4366-8aac-6eb6ec8d4934" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_a2c29ed5-f92a-4718-a021-852f22983608" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_58c12722-5419-4471-a9a7-8b43e8cd05ec" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_a2c29ed5-f92a-4718-a021-852f22983608" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_a1553276-38b7-4333-b1ec-eb8ba8b0e040" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_58c12722-5419-4471-a9a7-8b43e8cd05ec" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_a1553276-38b7-4333-b1ec-eb8ba8b0e040" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_3b67c817-5d8f-454b-a6a0-69f5c4744569" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_58c12722-5419-4471-a9a7-8b43e8cd05ec" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_3b67c817-5d8f-454b-a6a0-69f5c4744569" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_71078728-3233-4761-834c-b679f499fd1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_faf7977a-692b-47e0-b891-7478efb25199" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_fb76c667-4cae-4b38-b3c9-2db48dd5094c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_faf7977a-692b-47e0-b891-7478efb25199" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6477a210-170c-436a-8a7c-b3df2b7b52b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_faf7977a-692b-47e0-b891-7478efb25199" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_6477a210-170c-436a-8a7c-b3df2b7b52b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_fc5d18e5-353e-4988-8f8f-24d6f39373e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_faf7977a-692b-47e0-b891-7478efb25199" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_fc5d18e5-353e-4988-8f8f-24d6f39373e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_a400bc75-515b-4412-8eae-5c97b16d9001" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_faf7977a-692b-47e0-b891-7478efb25199" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_a400bc75-515b-4412-8eae-5c97b16d9001" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_fadc3d07-9d92-4fda-a44c-d03429be7a72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_faf7977a-692b-47e0-b891-7478efb25199" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_fadc3d07-9d92-4fda-a44c-d03429be7a72" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_71848784-f6eb-4e51-a6a2-9180eecad4cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/SegmentsNarrativeDetails" xlink:type="simple" xlink:href="din-20250630.xsd#SegmentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/SegmentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorDisclosureLineItems_4dd93ddd-ce6e-4fd9-8508-439fec3b1189" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FranchisorDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFranchisorDisclosureTable_1f2657ca-683b-4d86-b03d-61d5c2954c39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFranchisorDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FranchisorDisclosureLineItems_4dd93ddd-ce6e-4fd9-8508-439fec3b1189" xlink:to="loc_us-gaap_ScheduleOfFranchisorDisclosureTable_1f2657ca-683b-4d86-b03d-61d5c2954c39" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorDisclosureAxis_bcc1f556-36bf-4739-8f96-57d89680e009" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FranchisorDisclosureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFranchisorDisclosureTable_1f2657ca-683b-4d86-b03d-61d5c2954c39" xlink:to="loc_us-gaap_FranchisorDisclosureAxis_bcc1f556-36bf-4739-8f96-57d89680e009" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorDisclosureDomain_bcc1f556-36bf-4739-8f96-57d89680e009_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FranchisorDisclosureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FranchisorDisclosureAxis_bcc1f556-36bf-4739-8f96-57d89680e009" xlink:to="loc_us-gaap_FranchisorDisclosureDomain_bcc1f556-36bf-4739-8f96-57d89680e009_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorDisclosureDomain_6d73b48b-5205-4224-b5ab-2260e858f4ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FranchisorDisclosureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FranchisorDisclosureAxis_bcc1f556-36bf-4739-8f96-57d89680e009" xlink:to="loc_us-gaap_FranchisorDisclosureDomain_6d73b48b-5205-4224-b5ab-2260e858f4ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisedUnitsMember_604349c9-c645-4afc-97cc-28f8e3a3f89b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FranchisedUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureDomain_6d73b48b-5205-4224-b5ab-2260e858f4ec" xlink:to="loc_us-gaap_FranchisedUnitsMember_604349c9-c645-4afc-97cc-28f8e3a3f89b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityOperatedUnitsMember_0cac73ca-4096-49e0-82fa-d5c5753966b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EntityOperatedUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureDomain_6d73b48b-5205-4224-b5ab-2260e858f4ec" xlink:to="loc_us-gaap_EntityOperatedUnitsMember_0cac73ca-4096-49e0-82fa-d5c5753966b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_e324d8fd-08e5-4ee7-96bc-59ca232ed1af" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFranchisorDisclosureTable_1f2657ca-683b-4d86-b03d-61d5c2954c39" xlink:to="loc_dei_LegalEntityAxis_e324d8fd-08e5-4ee7-96bc-59ca232ed1af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_e324d8fd-08e5-4ee7-96bc-59ca232ed1af_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_e324d8fd-08e5-4ee7-96bc-59ca232ed1af" xlink:to="loc_dei_EntityDomain_e324d8fd-08e5-4ee7-96bc-59ca232ed1af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_9a47a547-21fb-4d86-a2d1-9f836d1b66ad" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_e324d8fd-08e5-4ee7-96bc-59ca232ed1af" xlink:to="loc_dei_EntityDomain_9a47a547-21fb-4d86-a2d1-9f836d1b66ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_ApplebeesMember_b33d445c-3abb-44bb-a185-a583102d3baf" xlink:href="din-20250630.xsd#din_ApplebeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_9a47a547-21fb-4d86-a2d1-9f836d1b66ad" xlink:to="loc_din_ApplebeesMember_b33d445c-3abb-44bb-a185-a583102d3baf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_IhopMember_6e1fa9dc-be23-42e2-bb60-e028bcb9b678" xlink:href="din-20250630.xsd#din_IhopMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_9a47a547-21fb-4d86-a2d1-9f836d1b66ad" xlink:to="loc_din_IhopMember_6e1fa9dc-be23-42e2-bb60-e028bcb9b678" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FuzzysMember_71ecf51a-7979-416f-a469-3b6183475c36" xlink:href="din-20250630.xsd#din_FuzzysMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_9a47a547-21fb-4d86-a2d1-9f836d1b66ad" xlink:to="loc_din_FuzzysMember_71ecf51a-7979-416f-a469-3b6183475c36" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_ffdfc478-7158-4913-ab77-52c94c9cb2b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureLineItems_4dd93ddd-ce6e-4fd9-8508-439fec3b1189" xlink:to="loc_us-gaap_NumberOfOperatingSegments_ffdfc478-7158-4913-ab77-52c94c9cb2b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_20eeec7b-5712-46b0-8a40-9341fd7cd71a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureLineItems_4dd93ddd-ce6e-4fd9-8508-439fec3b1189" xlink:to="loc_us-gaap_NumberOfReportableSegments_20eeec7b-5712-46b0-8a40-9341fd7cd71a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfRestaurants_aeaa2c49-843d-40a6-91c2-c7770e45b583" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfRestaurants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureLineItems_4dd93ddd-ce6e-4fd9-8508-439fec3b1189" xlink:to="loc_us-gaap_NumberOfRestaurants_aeaa2c49-843d-40a6-91c2-c7770e45b583" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_NumberOfTerritoriesInWhichEntityOperates_9c016567-42ae-4060-9b9f-c05ae3e3467b" xlink:href="din-20250630.xsd#din_NumberOfTerritoriesInWhichEntityOperates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureLineItems_4dd93ddd-ce6e-4fd9-8508-439fec3b1189" xlink:to="loc_din_NumberOfTerritoriesInWhichEntityOperates_9c016567-42ae-4060-9b9f-c05ae3e3467b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfCountriesInWhichEntityOperates_ce90a51e-e7c7-45dc-8b41-cc4ba52b821a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfCountriesInWhichEntityOperates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureLineItems_4dd93ddd-ce6e-4fd9-8508-439fec3b1189" xlink:to="loc_us-gaap_NumberOfCountriesInWhichEntityOperates_ce90a51e-e7c7-45dc-8b41-cc4ba52b821a" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/SegmentsScheduleofSegmentReportingInformationbySegmentDetails" xlink:type="simple" xlink:href="din-20250630.xsd#SegmentsScheduleofSegmentReportingInformationbySegmentDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/SegmentsScheduleofSegmentReportingInformationbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_be77b1c9-9f7f-4ab9-9f5b-47b866c1da8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_be77b1c9-9f7f-4ab9-9f5b-47b866c1da8e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_373a5534-c78a-4870-86b4-7864e6e36c21" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_be77b1c9-9f7f-4ab9-9f5b-47b866c1da8e" xlink:to="loc_srt_ConsolidationItemsAxis_373a5534-c78a-4870-86b4-7864e6e36c21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_373a5534-c78a-4870-86b4-7864e6e36c21_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_373a5534-c78a-4870-86b4-7864e6e36c21" xlink:to="loc_srt_ConsolidationItemsDomain_373a5534-c78a-4870-86b4-7864e6e36c21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_9c9becaa-5d68-47cc-afa2-dce1670c4e94" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_373a5534-c78a-4870-86b4-7864e6e36c21" xlink:to="loc_srt_ConsolidationItemsDomain_9c9becaa-5d68-47cc-afa2-dce1670c4e94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_4009d5f8-b2a0-4e25-92fe-ea2ef4d77a62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_9c9becaa-5d68-47cc-afa2-dce1670c4e94" xlink:to="loc_us-gaap_OperatingSegmentsMember_4009d5f8-b2a0-4e25-92fe-ea2ef4d77a62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_372238ba-fa57-45cc-9d09-ab9bfd71b104" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_9c9becaa-5d68-47cc-afa2-dce1670c4e94" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_372238ba-fa57-45cc-9d09-ab9bfd71b104" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_8640eb08-e746-4e4f-80f6-0cadda45df90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_be77b1c9-9f7f-4ab9-9f5b-47b866c1da8e" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_8640eb08-e746-4e4f-80f6-0cadda45df90" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8640eb08-e746-4e4f-80f6-0cadda45df90_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8640eb08-e746-4e4f-80f6-0cadda45df90" xlink:to="loc_us-gaap_SegmentDomain_8640eb08-e746-4e4f-80f6-0cadda45df90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_9e71b5a3-f0bf-4324-bd7b-8f69b7e30e01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8640eb08-e746-4e4f-80f6-0cadda45df90" xlink:to="loc_us-gaap_SegmentDomain_9e71b5a3-f0bf-4324-bd7b-8f69b7e30e01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FranchiseOperationsSegmentMember_79f6df28-21c3-4f6c-b76a-e4c219ccd715" xlink:href="din-20250630.xsd#din_FranchiseOperationsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9e71b5a3-f0bf-4324-bd7b-8f69b7e30e01" xlink:to="loc_din_FranchiseOperationsSegmentMember_79f6df28-21c3-4f6c-b76a-e4c219ccd715" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_CompanyRestaurantsSegmentMember_cd24f6cd-add0-4d8a-8f25-b828f5086cdd" xlink:href="din-20250630.xsd#din_CompanyRestaurantsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9e71b5a3-f0bf-4324-bd7b-8f69b7e30e01" xlink:to="loc_din_CompanyRestaurantsSegmentMember_cd24f6cd-add0-4d8a-8f25-b828f5086cdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RentalOperationsSegmentMember_fcd2b8b0-e235-4f34-9240-33d619c1b8de" xlink:href="din-20250630.xsd#din_RentalOperationsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9e71b5a3-f0bf-4324-bd7b-8f69b7e30e01" xlink:to="loc_din_RentalOperationsSegmentMember_fcd2b8b0-e235-4f34-9240-33d619c1b8de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FinancingOperationsSegmentMember_e2cbc6e3-5a35-498f-8f36-6c4b7b991287" xlink:href="din-20250630.xsd#din_FinancingOperationsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_9e71b5a3-f0bf-4324-bd7b-8f69b7e30e01" xlink:to="loc_din_FinancingOperationsSegmentMember_e2cbc6e3-5a35-498f-8f36-6c4b7b991287" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_c13f57a4-376f-4789-b873-f4c2b8241209" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_be77b1c9-9f7f-4ab9-9f5b-47b866c1da8e" xlink:to="loc_srt_ProductOrServiceAxis_c13f57a4-376f-4789-b873-f4c2b8241209" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c13f57a4-376f-4789-b873-f4c2b8241209_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_c13f57a4-376f-4789-b873-f4c2b8241209" xlink:to="loc_srt_ProductsAndServicesDomain_c13f57a4-376f-4789-b873-f4c2b8241209_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_6e07565f-cae9-4cef-8403-55d73bc86b47" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_c13f57a4-376f-4789-b873-f4c2b8241209" xlink:to="loc_srt_ProductsAndServicesDomain_6e07565f-cae9-4cef-8403-55d73bc86b47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FranchisorAdvertisingRevenueMember_fa7346dd-9650-4f67-b5fa-a6167fce41ec" xlink:href="din-20250630.xsd#din_FranchisorAdvertisingRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_6e07565f-cae9-4cef-8403-55d73bc86b47" xlink:to="loc_din_FranchisorAdvertisingRevenueMember_fa7346dd-9650-4f67-b5fa-a6167fce41ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FranchisorExcludingAdvertisingRevenueMember_ac241029-d784-4458-9d38-0574c2fddfe1" xlink:href="din-20250630.xsd#din_FranchisorExcludingAdvertisingRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_6e07565f-cae9-4cef-8403-55d73bc86b47" xlink:to="loc_din_FranchisorExcludingAdvertisingRevenueMember_ac241029-d784-4458-9d38-0574c2fddfe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_539fcca8-287d-4b65-b67e-e98e829cf378" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_Revenues_539fcca8-287d-4b65-b67e-e98e829cf378" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2b20203a-8480-4097-8ba3-3a33b10a1200" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_2b20203a-8480-4097-8ba3-3a33b10a1200" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RentalFinanceLeaseInterestExpense_50f4a587-a798-4c52-a832-ac2acf436106" xlink:href="din-20250630.xsd#din_RentalFinanceLeaseInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_din_RentalFinanceLeaseInterestExpense_50f4a587-a798-4c52-a832-ac2acf436106" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_c267ed10-cf93-412d-ba15-b7deacccfebd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldDepreciationAndAmortization_c267ed10-cf93-412d-ba15-b7deacccfebd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_c03f99f3-8521-420f-80d1-ed96dabbc52b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_c03f99f3-8521-420f-80d1-ed96dabbc52b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_bb3ec338-3e08-417f-8c87-6cf59d47fe50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_GrossProfit_bb3ec338-3e08-417f-8c87-6cf59d47fe50" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_59411186-d68c-4853-91bf-5df8fa7a71ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_59411186-d68c-4853-91bf-5df8fa7a71ae" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_e0b080e0-9f1f-4123-9f91-9e8cf043ed02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_e0b080e0-9f1f-4123-9f91-9e8cf043ed02" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherGeneralAndAdministrativeExpense_2aefa83a-7939-4ef6-ba11-95a24af33728" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_OtherGeneralAndAdministrativeExpense_2aefa83a-7939-4ef6-ba11-95a24af33728" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_5f744f3f-eebd-4271-8110-0f7a3e6f6197" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_OperatingIncomeLoss_5f744f3f-eebd-4271-8110-0f7a3e6f6197" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRevenueExpenseNet_e47bdf31-e8ca-43db-aa56-3d7059b9f9d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRevenueExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_InterestRevenueExpenseNet_e47bdf31-e8ca-43db-aa56-3d7059b9f9d5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_a66cec4f-9cec-46bc-92c1-0c19fd5dc5c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestructuringCostsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_a66cec4f-9cec-46bc-92c1-0c19fd5dc5c6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_74f57c96-89b7-494c-9e2c-069c90014227" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_74f57c96-89b7-494c-9e2c-069c90014227" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_eb8b7ed5-6ff6-43a4-acf1-c2a55bf351b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_eb8b7ed5-6ff6-43a4-acf1-c2a55bf351b6" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c6f2dca-4040-40ea-ba04-6e6acdd051c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_373e4565-8169-4a4e-90a1-719c99ac5231" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_2c6f2dca-4040-40ea-ba04-6e6acdd051c4" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/FairValueMeasurementsDetails" xlink:type="simple" xlink:href="din-20250630.xsd#FairValueMeasurementsDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/FairValueMeasurementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_cd2db1ae-cbf7-49b1-a137-aaedf786b4c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_6a4a6da5-fafe-4dc1-8326-006536b42da4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_cd2db1ae-cbf7-49b1-a137-aaedf786b4c7" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_6a4a6da5-fafe-4dc1-8326-006536b42da4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2b27d3a0-86f9-41b8-8be5-b800e6531ec2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_6a4a6da5-fafe-4dc1-8326-006536b42da4" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2b27d3a0-86f9-41b8-8be5-b800e6531ec2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2b27d3a0-86f9-41b8-8be5-b800e6531ec2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2b27d3a0-86f9-41b8-8be5-b800e6531ec2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2b27d3a0-86f9-41b8-8be5-b800e6531ec2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1da3a3bc-1700-4917-8d43-a2d2d22e8a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2b27d3a0-86f9-41b8-8be5-b800e6531ec2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1da3a3bc-1700-4917-8d43-a2d2d22e8a8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_fa71658a-f6f1-4faf-8813-cf8f70f6305b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1da3a3bc-1700-4917-8d43-a2d2d22e8a8c" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_fa71658a-f6f1-4faf-8813-cf8f70f6305b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_352bcb32-a434-4d9a-83b2-dec31d64fded" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_6a4a6da5-fafe-4dc1-8326-006536b42da4" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_352bcb32-a434-4d9a-83b2-dec31d64fded" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_352bcb32-a434-4d9a-83b2-dec31d64fded_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_352bcb32-a434-4d9a-83b2-dec31d64fded" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_352bcb32-a434-4d9a-83b2-dec31d64fded_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2bd19276-63fc-42e7-a7d1-2d97af3a7f63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_352bcb32-a434-4d9a-83b2-dec31d64fded" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2bd19276-63fc-42e7-a7d1-2d97af3a7f63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_64f11fd6-8705-42f2-b9e1-72670b33397b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_2bd19276-63fc-42e7-a7d1-2d97af3a7f63" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_64f11fd6-8705-42f2-b9e1-72670b33397b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_46920bc2-b543-443a-bf19-5e9ed48301a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_64f11fd6-8705-42f2-b9e1-72670b33397b" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_46920bc2-b543-443a-bf19-5e9ed48301a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_76965211-aa11-4a47-8e4c-cc7f5ee1a050" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_64f11fd6-8705-42f2-b9e1-72670b33397b" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_76965211-aa11-4a47-8e4c-cc7f5ee1a050" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_bf7d41db-5cf1-4626-b742-f04e05cf6344" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_cd2db1ae-cbf7-49b1-a137-aaedf786b4c7" xlink:to="loc_us-gaap_LongTermDebtFairValue_bf7d41db-5cf1-4626-b742-f04e05cf6344" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="din-20250630.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_d322f804-f625-49aa-9066-be37cec6d350" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_db7a006b-358e-4802-b838-50c57ebbb9f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_d322f804-f625-49aa-9066-be37cec6d350" xlink:to="loc_us-gaap_LossContingenciesTable_db7a006b-358e-4802-b838-50c57ebbb9f2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f4efdad4-9937-4bac-9117-cc81e73676bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_db7a006b-358e-4802-b838-50c57ebbb9f2" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f4efdad4-9937-4bac-9117-cc81e73676bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_f4efdad4-9937-4bac-9117-cc81e73676bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f4efdad4-9937-4bac-9117-cc81e73676bf" xlink:to="loc_us-gaap_LossContingencyNatureDomain_f4efdad4-9937-4bac-9117-cc81e73676bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_2a512c1a-2fdb-4116-99d3-3829654b4fcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_f4efdad4-9937-4bac-9117-cc81e73676bf" xlink:to="loc_us-gaap_LossContingencyNatureDomain_2a512c1a-2fdb-4116-99d3-3829654b4fcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyLeaseGuaranteeMember_21fe412a-f6bf-49d4-9cab-d470c743a743" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyLeaseGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_2a512c1a-2fdb-4116-99d3-3829654b4fcf" xlink:to="loc_us-gaap_PropertyLeaseGuaranteeMember_21fe412a-f6bf-49d4-9cab-d470c743a743" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_f2286f81-6ad6-4788-9fa3-ed6d6be9ecf7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_db7a006b-358e-4802-b838-50c57ebbb9f2" xlink:to="loc_dei_LegalEntityAxis_f2286f81-6ad6-4788-9fa3-ed6d6be9ecf7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_f2286f81-6ad6-4788-9fa3-ed6d6be9ecf7_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_f2286f81-6ad6-4788-9fa3-ed6d6be9ecf7" xlink:to="loc_dei_EntityDomain_f2286f81-6ad6-4788-9fa3-ed6d6be9ecf7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2cdf0f4e-5da1-4d99-9fa9-b9de7f4f9482" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_f2286f81-6ad6-4788-9fa3-ed6d6be9ecf7" xlink:to="loc_dei_EntityDomain_2cdf0f4e-5da1-4d99-9fa9-b9de7f4f9482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_ApplebeesMember_6f4d4a63-8575-457b-85cc-18699b08e80c" xlink:href="din-20250630.xsd#din_ApplebeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_2cdf0f4e-5da1-4d99-9fa9-b9de7f4f9482" xlink:to="loc_din_ApplebeesMember_6f4d4a63-8575-457b-85cc-18699b08e80c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_c433239e-34f2-41c3-abd2-37000c8d4748" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_d322f804-f625-49aa-9066-be37cec6d350" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_c433239e-34f2-41c3-abd2-37000c8d4748" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_GuarantorObligationsMaximumExposureExcludingUnexercisedOptionPeriodsUndiscounted_5c9b0c83-8062-4a94-9964-485912670c54" xlink:href="din-20250630.xsd#din_GuarantorObligationsMaximumExposureExcludingUnexercisedOptionPeriodsUndiscounted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_d322f804-f625-49aa-9066-be37cec6d350" xlink:to="loc_din_GuarantorObligationsMaximumExposureExcludingUnexercisedOptionPeriodsUndiscounted_5c9b0c83-8062-4a94-9964-485912670c54" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/CashCashEquivalentsandRestrictedCashScheduleofCashandCashEquivalentsDetails" xlink:type="simple" xlink:href="din-20250630.xsd#CashCashEquivalentsandRestrictedCashScheduleofCashandCashEquivalentsDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/CashCashEquivalentsandRestrictedCashScheduleofCashandCashEquivalentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsLineItems_cb6dcc79-72d6-417a-a349-4810b2a64a15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_c879440e-e17d-4ee7-9faa-aa4e91b7d39f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_cb6dcc79-72d6-417a-a349-4810b2a64a15" xlink:to="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_c879440e-e17d-4ee7-9faa-aa4e91b7d39f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_6af2928a-7751-43fe-8b4a-0708a7a62d03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_c879440e-e17d-4ee7-9faa-aa4e91b7d39f" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_6af2928a-7751-43fe-8b4a-0708a7a62d03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_6af2928a-7751-43fe-8b4a-0708a7a62d03_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_6af2928a-7751-43fe-8b4a-0708a7a62d03" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_6af2928a-7751-43fe-8b4a-0708a7a62d03_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_71f22cd6-f645-4be0-9619-2c37b4ad646a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_6af2928a-7751-43fe-8b4a-0708a7a62d03" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_71f22cd6-f645-4be0-9619-2c37b4ad646a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_c9965b9d-f0d7-47bc-86d7-164fd791be1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_71f22cd6-f645-4be0-9619-2c37b4ad646a" xlink:to="loc_us-gaap_MoneyMarketFundsMember_c9965b9d-f0d7-47bc-86d7-164fd791be1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_AdvertisingFundsAndGiftCardProgramMember_fc853da6-c426-49cc-9fff-b2886b493656" xlink:href="din-20250630.xsd#din_AdvertisingFundsAndGiftCardProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_71f22cd6-f645-4be0-9619-2c37b4ad646a" xlink:to="loc_din_AdvertisingFundsAndGiftCardProgramMember_fc853da6-c426-49cc-9fff-b2886b493656" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepositAccountMember_36fc7405-14be-4b14-949e-cf74a346ed07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositAccountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_71f22cd6-f645-4be0-9619-2c37b4ad646a" xlink:to="loc_us-gaap_DepositAccountMember_36fc7405-14be-4b14-949e-cf74a346ed07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_5733f819-08a7-489f-b3bf-a80188504d11" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCashAndCashEquivalentsTable_c879440e-e17d-4ee7-9faa-aa4e91b7d39f" xlink:to="loc_dei_LegalEntityAxis_5733f819-08a7-489f-b3bf-a80188504d11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_5733f819-08a7-489f-b3bf-a80188504d11_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_5733f819-08a7-489f-b3bf-a80188504d11" xlink:to="loc_dei_EntityDomain_5733f819-08a7-489f-b3bf-a80188504d11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_bdf27346-2339-4550-a36e-5fc1bbdc59b8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_5733f819-08a7-489f-b3bf-a80188504d11" xlink:to="loc_dei_EntityDomain_bdf27346-2339-4550-a36e-5fc1bbdc59b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_IhopMember_40a38333-b0d9-4611-8621-e5ee711acf8b" xlink:href="din-20250630.xsd#din_IhopMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_bdf27346-2339-4550-a36e-5fc1bbdc59b8" xlink:to="loc_din_IhopMember_40a38333-b0d9-4611-8621-e5ee711acf8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_d3dbe5be-3c0f-4e0d-9b92-59fdef0d8bdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashAndCashEquivalentsLineItems_cb6dcc79-72d6-417a-a349-4810b2a64a15" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_d3dbe5be-3c0f-4e0d-9b92-59fdef0d8bdf" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/CashCashEquivalentsandRestrictedCashScheduleofCurrentRestrictedCashDetails" xlink:type="simple" xlink:href="din-20250630.xsd#CashCashEquivalentsandRestrictedCashScheduleofCurrentRestrictedCashDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/CashCashEquivalentsandRestrictedCashScheduleofCurrentRestrictedCashDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_59dcbe27-be84-4db1-baa3-006c456bd746" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_2c031326-d6e8-400b-9831-a6d9dd480d1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_59dcbe27-be84-4db1-baa3-006c456bd746" xlink:to="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_2c031326-d6e8-400b-9831-a6d9dd480d1c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_0bdc8b43-f0e2-4148-b658-77769b0700fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_2c031326-d6e8-400b-9831-a6d9dd480d1c" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_0bdc8b43-f0e2-4148-b658-77769b0700fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_0bdc8b43-f0e2-4148-b658-77769b0700fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_0bdc8b43-f0e2-4148-b658-77769b0700fe" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_0bdc8b43-f0e2-4148-b658-77769b0700fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_4638d39b-203f-4420-8b76-ab2960c05e5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis_0bdc8b43-f0e2-4148-b658-77769b0700fe" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_4638d39b-203f-4420-8b76-ab2960c05e5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_SecuritizedDebtReserveMember_fad1ecbd-d2fc-49a8-962a-99ed29db3070" xlink:href="din-20250630.xsd#din_SecuritizedDebtReserveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_4638d39b-203f-4420-8b76-ab2960c05e5b" xlink:to="loc_din_SecuritizedDebtReserveMember_fad1ecbd-d2fc-49a8-962a-99ed29db3070" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_HeldforAdvertisingActivityDepositsMember_92dcb4c5-89f8-4fea-b95a-1b225edb407d" xlink:href="din-20250630.xsd#din_HeldforAdvertisingActivityDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_4638d39b-203f-4420-8b76-ab2960c05e5b" xlink:to="loc_din_HeldforAdvertisingActivityDepositsMember_92dcb4c5-89f8-4fea-b95a-1b225edb407d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_OtherCurrentRestrictedCashMember_b6b9682d-0933-4321-b268-613a32374bf6" xlink:href="din-20250630.xsd#din_OtherCurrentRestrictedCashMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_4638d39b-203f-4420-8b76-ab2960c05e5b" xlink:to="loc_din_OtherCurrentRestrictedCashMember_b6b9682d-0933-4321-b268-613a32374bf6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_db409320-4bdb-4bbb-92ec-9c3737c596de" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_2c031326-d6e8-400b-9831-a6d9dd480d1c" xlink:to="loc_dei_LegalEntityAxis_db409320-4bdb-4bbb-92ec-9c3737c596de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_db409320-4bdb-4bbb-92ec-9c3737c596de_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_db409320-4bdb-4bbb-92ec-9c3737c596de" xlink:to="loc_dei_EntityDomain_db409320-4bdb-4bbb-92ec-9c3737c596de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01fbeee6-92a0-4578-895e-cffbdb83fcd8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_db409320-4bdb-4bbb-92ec-9c3737c596de" xlink:to="loc_dei_EntityDomain_01fbeee6-92a0-4578-895e-cffbdb83fcd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_ApplebeesMember_e70f7246-4510-4f0b-b67b-c52f34d00bd8" xlink:href="din-20250630.xsd#din_ApplebeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_01fbeee6-92a0-4578-895e-cffbdb83fcd8" xlink:to="loc_din_ApplebeesMember_e70f7246-4510-4f0b-b67b-c52f34d00bd8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashCurrent_753adbc8-fb4e-4ab9-8056-a7a3de7bb2a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_59dcbe27-be84-4db1-baa3-006c456bd746" xlink:to="loc_us-gaap_RestrictedCashCurrent_753adbc8-fb4e-4ab9-8056-a7a3de7bb2a8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/BusinessAcquisitionNarrativeDetails" xlink:type="simple" xlink:href="din-20250630.xsd#BusinessAcquisitionNarrativeDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/BusinessAcquisitionNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_989e4d8c-1470-4100-b8b9-bb7cab58f360" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1945c387-13df-4e85-8725-cb4e29e2b915" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_989e4d8c-1470-4100-b8b9-bb7cab58f360" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1945c387-13df-4e85-8725-cb4e29e2b915" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_828fb272-510b-4583-b52b-f36be968837a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1945c387-13df-4e85-8725-cb4e29e2b915" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_828fb272-510b-4583-b52b-f36be968837a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_828fb272-510b-4583-b52b-f36be968837a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_828fb272-510b-4583-b52b-f36be968837a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_828fb272-510b-4583-b52b-f36be968837a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d1be0059-88f2-4f36-a9d7-ca6f4a0398ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_828fb272-510b-4583-b52b-f36be968837a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d1be0059-88f2-4f36-a9d7-ca6f4a0398ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_ApplebeesRestaurantsMember_f5a0e53c-3f68-45f8-8e58-265d3aa055fb" xlink:href="din-20250630.xsd#din_ApplebeesRestaurantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d1be0059-88f2-4f36-a9d7-ca6f4a0398ca" xlink:to="loc_din_ApplebeesRestaurantsMember_f5a0e53c-3f68-45f8-8e58-265d3aa055fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_IHOPRestaurantsMember_560cbb04-4d91-4bef-b3f9-28602d917118" xlink:href="din-20250630.xsd#din_IHOPRestaurantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d1be0059-88f2-4f36-a9d7-ca6f4a0398ca" xlink:to="loc_din_IHOPRestaurantsMember_560cbb04-4d91-4bef-b3f9-28602d917118" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_5ccc1160-719d-468d-aeba-609c5724f75d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_989e4d8c-1470-4100-b8b9-bb7cab58f360" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_5ccc1160-719d-468d-aeba-609c5724f75d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_b5772ff6-ac1f-4bbc-b340-8eeb4aad4798" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_989e4d8c-1470-4100-b8b9-bb7cab58f360" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_b5772ff6-ac1f-4bbc-b340-8eeb4aad4798" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_6457fde4-d287-4c68-a1d7-07412425e6f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_989e4d8c-1470-4100-b8b9-bb7cab58f360" xlink:to="loc_us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount_6457fde4-d287-4c68-a1d7-07412425e6f8" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/BusinessAcquisitionIHOPFairValueOfNetAssetsAcquiredDetails" xlink:type="simple" xlink:href="din-20250630.xsd#BusinessAcquisitionIHOPFairValueOfNetAssetsAcquiredDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/BusinessAcquisitionIHOPFairValueOfNetAssetsAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_11059563-c2ce-4891-b651-613260f898e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c6d7a056-fef7-46d8-86c2-3160bc584175" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_11059563-c2ce-4891-b651-613260f898e9" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c6d7a056-fef7-46d8-86c2-3160bc584175" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8e58e193-378b-4679-a885-aa1e69ec9c52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c6d7a056-fef7-46d8-86c2-3160bc584175" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8e58e193-378b-4679-a885-aa1e69ec9c52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8e58e193-378b-4679-a885-aa1e69ec9c52_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8e58e193-378b-4679-a885-aa1e69ec9c52" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8e58e193-378b-4679-a885-aa1e69ec9c52_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_83ad7dad-4a25-40d4-afef-3cca72042c35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8e58e193-378b-4679-a885-aa1e69ec9c52" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_83ad7dad-4a25-40d4-afef-3cca72042c35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_IHOPRestaurantsMember_90b7e899-21e5-494f-8df9-2d938427c984" xlink:href="din-20250630.xsd#din_IHOPRestaurantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_83ad7dad-4a25-40d4-afef-3cca72042c35" xlink:to="loc_din_IHOPRestaurantsMember_90b7e899-21e5-494f-8df9-2d938427c984" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_5730052c-0011-458d-a473-38f859808da1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_11059563-c2ce-4891-b651-613260f898e9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_5730052c-0011-458d-a473-38f859808da1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventoryAndOtherCurrentAssets_1286c7c7-35be-4bf8-8b28-87a4eb8439c8" xlink:href="din-20250630.xsd#din_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventoryAndOtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_11059563-c2ce-4891-b651-613260f898e9" xlink:to="loc_din_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventoryAndOtherCurrentAssets_1286c7c7-35be-4bf8-8b28-87a4eb8439c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivablesCredit_1aa8ce1d-5610-4599-9afc-a38f26486748" xlink:href="din-20250630.xsd#din_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivablesCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_11059563-c2ce-4891-b651-613260f898e9" xlink:to="loc_din_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivablesCredit_1aa8ce1d-5610-4599-9afc-a38f26486748" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4d973d23-fc84-499f-bcba-2d7170649698" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_11059563-c2ce-4891-b651-613260f898e9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_4d973d23-fc84-499f-bcba-2d7170649698" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_6981c59d-702b-4fb6-aa1b-d2ea5dfd5468" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_11059563-c2ce-4891-b651-613260f898e9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_6981c59d-702b-4fb6-aa1b-d2ea5dfd5468" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_6bba9f3e-ebe7-4d53-b7a5-f2fd0211fdc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_11059563-c2ce-4891-b651-613260f898e9" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_6bba9f3e-ebe7-4d53-b7a5-f2fd0211fdc8" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://dineequity.com/role/BusinessAcquisitionApplebeesFairValueOfNetAssetsAcquiredDetails" xlink:type="simple" xlink:href="din-20250630.xsd#BusinessAcquisitionApplebeesFairValueOfNetAssetsAcquiredDetails"/>
  <link:definitionLink xlink:role="http://dineequity.com/role/BusinessAcquisitionApplebeesFairValueOfNetAssetsAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_976fd01c-9534-432f-8c5e-3f43a118a1de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_976fd01c-9534-432f-8c5e-3f43a118a1de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_e23669c2-73dc-4554-9eaa-00ac17265147" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_976fd01c-9534-432f-8c5e-3f43a118a1de" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_e23669c2-73dc-4554-9eaa-00ac17265147" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e23669c2-73dc-4554-9eaa-00ac17265147_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_e23669c2-73dc-4554-9eaa-00ac17265147" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e23669c2-73dc-4554-9eaa-00ac17265147_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2d56a497-7106-46a8-8003-814238533f2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_e23669c2-73dc-4554-9eaa-00ac17265147" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2d56a497-7106-46a8-8003-814238533f2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_ApplebeesRestaurantsMember_8b86f329-42e3-4d5e-ba8e-2e883916113c" xlink:href="din-20250630.xsd#din_ApplebeesRestaurantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2d56a497-7106-46a8-8003-814238533f2a" xlink:to="loc_din_ApplebeesRestaurantsMember_8b86f329-42e3-4d5e-ba8e-2e883916113c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_BusinessCombinationRecognizedAssetAcquiredOffMarketLease_bb834081-e6e4-400c-b078-92823bc33415" xlink:href="din-20250630.xsd#din_BusinessCombinationRecognizedAssetAcquiredOffMarketLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:to="loc_din_BusinessCombinationRecognizedAssetAcquiredOffMarketLease_bb834081-e6e4-400c-b078-92823bc33415" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_59b7ebd3-7e2d-4c76-a98e-9f0fa0cc1d9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_59b7ebd3-7e2d-4c76-a98e-9f0fa0cc1d9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_BusinessCombinationRecognizedAssetsAcquiredInventoryAndOtherCurrentAssets_219e3c8c-ea1a-458f-8c40-0a080956d3b7" xlink:href="din-20250630.xsd#din_BusinessCombinationRecognizedAssetsAcquiredInventoryAndOtherCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:to="loc_din_BusinessCombinationRecognizedAssetsAcquiredInventoryAndOtherCurrentAssets_219e3c8c-ea1a-458f-8c40-0a080956d3b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_56949e4a-953a-4ebb-a3ea-92dcad6aa9d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_56949e4a-953a-4ebb-a3ea-92dcad6aa9d0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_30e5e44d-0f96-49bb-9ca3-874cd99b3545" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_30e5e44d-0f96-49bb-9ca3-874cd99b3545" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1e9d6155-ac36-44d9-a3d7-ec7ce6125c91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_1e9d6155-ac36-44d9-a3d7-ec7ce6125c91" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_53f28f9d-5a03-4f4a-90a3-6c7052ee15ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:to="loc_us-gaap_Goodwill_53f28f9d-5a03-4f4a-90a3-6c7052ee15ea" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_9b04500d-87aa-4833-a2a4-cb933748347d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f29648ff-fa58-49b5-85bc-c3a9aaa92ae0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_9b04500d-87aa-4833-a2a4-cb933748347d" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_FinanceLeaseAndFinancingObligationsCurrent_549e0656-0da8-47a3-a133-8cf09de3ed34" xlink:href="din-20250630.xsd#din_FinanceLeaseAndFinancingObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_din_FinanceLeaseAndFinancingObligationsCurrent_549e0656-0da8-47a3-a133-8cf09de3ed34" xlink:type="arc" order="41"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_din_RentalIncome_4e00d2dd-1ec4-4f21-be75-9e69a47b59f0" xlink:href="din-20250630.xsd#din_RentalIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_din_RentalIncome_4e00d2dd-1ec4-4f21-be75-9e69a47b59f0" xlink:type="arc" order="691"/>
  </link:definitionLink>
</link:linkbase>
