<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
    <!-- Field: Doc-Info; Name: Generator; Value: GoFiler Complete; Version: 5.21b -->
    <!-- Field: Doc-Info; Name: VendorURI; Value: https://www.novaworks.com -->
    <!-- Field: Doc-Info; Name: Status; Value: 0x00000000 -->
<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <link:roleRef roleURI="http://rtx.com/role/Cover" xlink:href="rtx-20240502.xsd#Cover" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/PvpDisclosureWithAdditionalMeasures" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#PvpDisclosureWithAdditionalMeasures" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/PvpTable" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#PvpTable" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/PvpAdjustmentsToCompensation" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#PvpAdjustmentsToCompensation" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/TabularListsByExecutiveCategory" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#TabularListsByExecutiveCategory" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/TabularListMeasures" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#TabularListMeasures" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/PvpMeasures" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#PvpMeasures" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/PvpExecutiveCategoriesOnly" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#PvpExecutiveCategoriesOnly" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/PvpAdjustmentsOnly" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#PvpAdjustmentsOnly" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/IndividualsOnly" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#IndividualsOnly" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardTypeOnly" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/TradingArrangementsOnly" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#TradingArrangmentsOnly" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/ForgoneRecoveries" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#ForgoneRecoveries" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/OutstandingRecoveries" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#OutstandingRecoveries" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/AwardsCloseToMnpiDisc" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardsCloseToMnpiDisc" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/InsiderTradingArrangementsByInd" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#InsiderTradingArrangemenstByInd" xlink:type="simple" />
    <link:roleRef roleURI="http://xbrl.sec.gov/ecd/role/Defaults" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#Defaults" xlink:type="simple" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" arcroleURI="http://xbrl.org/int/dim/arcrole/all" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" />
    <link:arcroleRef xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" />
    <link:definitionLink xlink:type="extended" xlink:role="http://rtx.com/role/Cover" xlink:title="00000001 - Document - Cover" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/ecd/role/PvpExecutiveCategoriesOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/ecd/role/PvpAdjustmentsOnly">
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#ecd_AllAdjToCompMember" xlink:label="loc_ecdAllAdjToCompMember" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberStockAwardsMember" xlink:label="loc_RTXPEOMemberStockAwardsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberStockAwardsMember" xlink:type="arc" order="0" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberOptionAwardsMember" xlink:label="loc_RTXPEOMemberOptionAwardsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberOptionAwardsMember" xlink:type="arc" order="10" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberChangeInPresentValueOfPensionBenefitsMember" xlink:label="loc_RTXPEOMemberChangeInPresentValueOfPensionBenefitsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberChangeInPresentValueOfPensionBenefitsMember" xlink:type="arc" order="20" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberTotalDeductionsFromSCTMember" xlink:label="loc_RTXPEOMemberTotalDeductionsFromSCTMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberTotalDeductionsFromSCTMember" xlink:type="arc" order="30" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberFairValueOfAwardsGrantedDuringYearAndUnvestedasOfYearEndMember" xlink:label="loc_RTXPEOMemberFairValueOfAwardsGrantedDuringYearAndUnvestedasOfYearEndMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberFairValueOfAwardsGrantedDuringYearAndUnvestedasOfYearEndMember" xlink:type="arc" order="40" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberFairValueofAwardsGrantedandVestedDuringtheYearMember" xlink:label="loc_RTXPEOMemberFairValueofAwardsGrantedandVestedDuringtheYearMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberFairValueofAwardsGrantedandVestedDuringtheYearMember" xlink:type="arc" order="50" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberChangeInFairValueOfPriorYearAwardsUnvestedasOfYearEndMember" xlink:label="loc_RTXPEOMemberChangeInFairValueOfPriorYearAwardsUnvestedasOfYearEndMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberChangeInFairValueOfPriorYearAwardsUnvestedasOfYearEndMember" xlink:type="arc" order="60" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberChangeInFairValueOfPriorYearAwardsThatVestedDuringYearMember" xlink:label="loc_RTXPEOMemberChangeInFairValueOfPriorYearAwardsThatVestedDuringYearMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberChangeInFairValueOfPriorYearAwardsThatVestedDuringYearMember" xlink:type="arc" order="70" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberChangeInFairValueOfPriorYearAwardsThatForfeitedDuringYearMember" xlink:label="loc_RTXPEOMemberChangeInFairValueOfPriorYearAwardsThatForfeitedDuringYearMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberChangeInFairValueOfPriorYearAwardsThatForfeitedDuringYearMember" xlink:type="arc" order="80" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberDividendsOtherEarningsPaidOnUnvestedAwardsDuringYearMember" xlink:label="loc_RTXPEOMemberDividendsOtherEarningsPaidOnUnvestedAwardsDuringYearMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberDividendsOtherEarningsPaidOnUnvestedAwardsDuringYearMember" xlink:type="arc" order="90" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberServiceCostOfPensionBenefitsMember" xlink:label="loc_RTXPEOMemberServiceCostOfPensionBenefitsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberServiceCostOfPensionBenefitsMember" xlink:type="arc" order="100" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberPriorServiceCostOfPensionBenefitsMember" xlink:label="loc_RTXPEOMemberPriorServiceCostOfPensionBenefitsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberPriorServiceCostOfPensionBenefitsMember" xlink:type="arc" order="110" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_PEOMemberTotalAdditionsToCAPMember" xlink:label="loc_RTXPEOMemberTotalAdditionsToCAPMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXPEOMemberTotalAdditionsToCAPMember" xlink:type="arc" order="120" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberStockAwardsMember" xlink:label="loc_RTXNonPEONEOMemberStockAwardsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberStockAwardsMember" xlink:type="arc" order="130" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberOptionAwardsMember" xlink:label="loc_RTXNonPEONEOMemberOptionAwardsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberOptionAwardsMember" xlink:type="arc" order="140" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberChangeInPresentValueOfPensionBenefitsMember" xlink:label="loc_RTXNonPEONEOMemberChangeInPresentValueOfPensionBenefitsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberChangeInPresentValueOfPensionBenefitsMember" xlink:type="arc" order="150" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberTotalDeductionsFromSCTMember" xlink:label="loc_RTXNonPEONEOMemberTotalDeductionsFromSCTMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberTotalDeductionsFromSCTMember" xlink:type="arc" order="160" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberFairValueOfAwardsGrantedDuringYearAndUnvestedasOfYearEndMember" xlink:label="loc_RTXNonPEONEOMemberFairValueOfAwardsGrantedDuringYearAndUnvestedasOfYearEndMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberFairValueOfAwardsGrantedDuringYearAndUnvestedasOfYearEndMember" xlink:type="arc" order="170" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberFairValueofAwardsGrantedAndVestedDuringTheYearMember" xlink:label="loc_RTXNonPEONEOMemberFairValueofAwardsGrantedAndVestedDuringTheYearMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberFairValueofAwardsGrantedAndVestedDuringTheYearMember" xlink:type="arc" order="180" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberChangeInFairValueOfPriorYearAwardsUnvestedasOfYearEndMember" xlink:label="loc_RTXNonPEONEOMemberChangeInFairValueOfPriorYearAwardsUnvestedasOfYearEndMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberChangeInFairValueOfPriorYearAwardsUnvestedasOfYearEndMember" xlink:type="arc" order="190" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberChangeInFairValueOfPriorYearAwardsThatVestedDuringYearMember" xlink:label="loc_RTXNonPEONEOMemberChangeInFairValueOfPriorYearAwardsThatVestedDuringYearMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberChangeInFairValueOfPriorYearAwardsThatVestedDuringYearMember" xlink:type="arc" order="200" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberChangeInFairValueOfPriorYearAwardsThatForfeitedDuringYearMember" xlink:label="loc_RTXNonPEONEOMemberChangeInFairValueOfPriorYearAwardsThatForfeitedDuringYearMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberChangeInFairValueOfPriorYearAwardsThatForfeitedDuringYearMember" xlink:type="arc" order="210" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberDividendsOtherEarningsPaidOnUnvestedAwardsDuringYearMember" xlink:label="loc_RTXNonPEONEOMemberDividendsOtherEarningsPaidOnUnvestedAwardsDuringYearMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberDividendsOtherEarningsPaidOnUnvestedAwardsDuringYearMember" xlink:type="arc" order="220" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberServiceCostOfPensionBenefitsMember" xlink:label="loc_RTXNonPEONEOMemberServiceCostOfPensionBenefitsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberServiceCostOfPensionBenefitsMember" xlink:type="arc" order="230" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberPriorServiceCostOfPensionBenefitsMember" xlink:label="loc_RTXNonPEONEOMemberPriorServiceCostOfPensionBenefitsMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberPriorServiceCostOfPensionBenefitsMember" xlink:type="arc" order="240" />
      <link:loc xlink:type="locator" xlink:href="rtx-20240502.xsd#RTX_NonPEONEOMemberTotalAdditionsToCAPMember" xlink:label="loc_RTXNonPEONEOMemberTotalAdditionsToCAPMember" />
      <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ecdAllAdjToCompMember" xlink:to="loc_RTXNonPEONEOMemberTotalAdditionsToCAPMember" xlink:type="arc" order="250" />
    </link:definitionLink>
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/ecd/role/IndividualsOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" />
    <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/ecd/role/TradingArrangementsOnly" />
</link:linkbase>
