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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019c09b6-06a1-7891-bd5e-e40eb86e0f8e,g:54c5836b-f715-4fab-9c3a-f53644462d37-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:lmt="http://www.lockheedmartin.com/20260329" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.lockheedmartin.com/20260329">
  <xs:import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lmt-20260329_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lmt-20260329_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lmt-20260329_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="lmt-20260329_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.lockheedmartin.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofEarnings" roleURI="http://www.lockheedmartin.com/role/ConsolidatedStatementsofEarnings">
        <link:definition>9952151 - Statement - Consolidated Statements of Earnings</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofComprehensiveIncome" roleURI="http://www.lockheedmartin.com/role/ConsolidatedStatementsofComprehensiveIncome">
        <link:definition>9952152 - Statement - Consolidated Statements of Comprehensive Income</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofComprehensiveIncomeParenthetical" roleURI="http://www.lockheedmartin.com/role/ConsolidatedStatementsofComprehensiveIncomeParenthetical">
        <link:definition>9952153 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheets" roleURI="http://www.lockheedmartin.com/role/ConsolidatedBalanceSheets">
        <link:definition>9952154 - Statement - Consolidated Balance Sheets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedBalanceSheetsParenthetical" roleURI="http://www.lockheedmartin.com/role/ConsolidatedBalanceSheetsParenthetical">
        <link:definition>9952155 - Statement - Consolidated Balance Sheets (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofCashFlows" roleURI="http://www.lockheedmartin.com/role/ConsolidatedStatementsofCashFlows">
        <link:definition>9952156 - Statement - Consolidated Statements of Cash Flows</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofEquity" roleURI="http://www.lockheedmartin.com/role/ConsolidatedStatementsofEquity">
        <link:definition>9952157 - Statement - Consolidated Statements of Equity</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ConsolidatedStatementsofEquityParenthetical" roleURI="http://www.lockheedmartin.com/role/ConsolidatedStatementsofEquityParenthetical">
        <link:definition>9952158 - Statement - Consolidated Statements of Equity (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BASISOFPRESENTATION" roleURI="http://www.lockheedmartin.com/role/BASISOFPRESENTATION">
        <link:definition>9952159 - Disclosure - BASIS OF PRESENTATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERCOMMONSHARE" roleURI="http://www.lockheedmartin.com/role/EARNINGSPERCOMMONSHARE">
        <link:definition>9952160 - Disclosure - EARNINGS PER COMMON SHARE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONBUSINESSSEGMENTS" roleURI="http://www.lockheedmartin.com/role/INFORMATIONONBUSINESSSEGMENTS">
        <link:definition>9952161 - Disclosure - INFORMATION ON BUSINESS SEGMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONTRACTASSETSANDLIABILITIES" roleURI="http://www.lockheedmartin.com/role/CONTRACTASSETSANDLIABILITIES">
        <link:definition>9952162 - Disclosure - CONTRACT ASSETS AND LIABILITIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIES" roleURI="http://www.lockheedmartin.com/role/INVENTORIES">
        <link:definition>9952163 - Disclosure - INVENTORIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RETIREMENTBENEFITS" roleURI="http://www.lockheedmartin.com/role/RETIREMENTBENEFITS">
        <link:definition>9952164 - Disclosure - RETIREMENT BENEFITS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEGALPROCEEDINGSANDCONTINGENCIES" roleURI="http://www.lockheedmartin.com/role/LEGALPROCEEDINGSANDCONTINGENCIES">
        <link:definition>9952165 - Disclosure - LEGAL PROCEEDINGS AND CONTINGENCIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTS" roleURI="http://www.lockheedmartin.com/role/FAIRVALUEMEASUREMENTS">
        <link:definition>9952166 - Disclosure - FAIR VALUE MEASUREMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITY" roleURI="http://www.lockheedmartin.com/role/STOCKHOLDERSEQUITY">
        <link:definition>9952167 - Disclosure - STOCKHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHER" roleURI="http://www.lockheedmartin.com/role/OTHER">
        <link:definition>9952168 - Disclosure - OTHER</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RECENTACCOUNTINGPRONOUNCEMENTS" roleURI="http://www.lockheedmartin.com/role/RECENTACCOUNTINGPRONOUNCEMENTS">
        <link:definition>9952169 - Disclosure - RECENT ACCOUNTING PRONOUNCEMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RECENTACCOUNTINGPRONOUNCEMENTSPolicies" roleURI="http://www.lockheedmartin.com/role/RECENTACCOUNTINGPRONOUNCEMENTSPolicies">
        <link:definition>9955511 - Disclosure - RECENT ACCOUNTING PRONOUNCEMENTS (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERCOMMONSHARETables" roleURI="http://www.lockheedmartin.com/role/EARNINGSPERCOMMONSHARETables">
        <link:definition>9955512 - Disclosure - EARNINGS PER COMMON SHARE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONBUSINESSSEGMENTSTables" roleURI="http://www.lockheedmartin.com/role/INFORMATIONONBUSINESSSEGMENTSTables">
        <link:definition>9955513 - Disclosure - INFORMATION ON BUSINESS SEGMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONTRACTASSETSANDLIABILITIESTables" roleURI="http://www.lockheedmartin.com/role/CONTRACTASSETSANDLIABILITIESTables">
        <link:definition>9955514 - Disclosure - CONTRACT ASSETS AND LIABILITIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INVENTORIESTables" roleURI="http://www.lockheedmartin.com/role/INVENTORIESTables">
        <link:definition>9955515 - Disclosure - INVENTORIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RETIREMENTBENEFITSTables" roleURI="http://www.lockheedmartin.com/role/RETIREMENTBENEFITSTables">
        <link:definition>9955516 - Disclosure - RETIREMENT BENEFITS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSTables" roleURI="http://www.lockheedmartin.com/role/FAIRVALUEMEASUREMENTSTables">
        <link:definition>9955517 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYTables" roleURI="http://www.lockheedmartin.com/role/STOCKHOLDERSEQUITYTables">
        <link:definition>9955518 - Disclosure - STOCKHOLDERS' EQUITY (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHERTables" roleURI="http://www.lockheedmartin.com/role/OTHERTables">
        <link:definition>9955519 - Disclosure - OTHER (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERCOMMONSHAREScheduleofWeightedAverageSharesOutstandingUsedtoComputeEarningsPerCommonShareDetails" roleURI="http://www.lockheedmartin.com/role/EARNINGSPERCOMMONSHAREScheduleofWeightedAverageSharesOutstandingUsedtoComputeEarningsPerCommonShareDetails">
        <link:definition>9955520 - Disclosure - EARNINGS PER COMMON SHARE - Schedule of Weighted Average Shares Outstanding Used to Compute Earnings Per Common Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERCOMMONSHARENarrativeDetails" roleURI="http://www.lockheedmartin.com/role/EARNINGSPERCOMMONSHARENarrativeDetails">
        <link:definition>9955521 - Disclosure - EARNINGS PER COMMON SHARE - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONBUSINESSSEGMENTSNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/INFORMATIONONBUSINESSSEGMENTSNarrativeDetails">
        <link:definition>9955522 - Disclosure - INFORMATION ON BUSINESS SEGMENTS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONBUSINESSSEGMENTSScheduleofFinancialInformationforEachBusinessSegmentDetails" roleURI="http://www.lockheedmartin.com/role/INFORMATIONONBUSINESSSEGMENTSScheduleofFinancialInformationforEachBusinessSegmentDetails">
        <link:definition>9955523 - Disclosure - INFORMATION ON BUSINESS SEGMENTS - Schedule of Financial Information for Each Business Segment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONBUSINESSSEGMENTSScheduleofFASCASPensionAdjustmentDetails" roleURI="http://www.lockheedmartin.com/role/INFORMATIONONBUSINESSSEGMENTSScheduleofFASCASPensionAdjustmentDetails">
        <link:definition>9955524 - Disclosure - INFORMATION ON BUSINESS SEGMENTS - Schedule of FAS/CAS Pension Adjustment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONBUSINESSSEGMENTSScheduleofFASCASPensionAdjustmentDetails_1" roleURI="http://www.lockheedmartin.com/role/INFORMATIONONBUSINESSSEGMENTSScheduleofFASCASPensionAdjustmentDetails_1">
        <link:definition>9955524 - Disclosure - INFORMATION ON BUSINESS SEGMENTS - Schedule of FAS/CAS Pension Adjustment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONBUSINESSSEGMENTSScheduleofIncomeStatementInformationForEachSegmentDetails" roleURI="http://www.lockheedmartin.com/role/INFORMATIONONBUSINESSSEGMENTSScheduleofIncomeStatementInformationForEachSegmentDetails">
        <link:definition>9955525 - Disclosure - INFORMATION ON BUSINESS SEGMENTS - Schedule of Income Statement Information For Each Segment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INFORMATIONONBUSINESSSEGMENTSScheduleofTotalAssetsandCustomerAdvancesandAmountsInExcessOfCostsIncurredForEachBusinessSegmentDetails" roleURI="http://www.lockheedmartin.com/role/INFORMATIONONBUSINESSSEGMENTSScheduleofTotalAssetsandCustomerAdvancesandAmountsInExcessOfCostsIncurredForEachBusinessSegmentDetails">
        <link:definition>9955526 - Disclosure - INFORMATION ON BUSINESS SEGMENTS - Schedule of Total Assets and Customer Advances and Amounts In Excess Of Costs Incurred For Each Business Segment (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONTRACTASSETSANDLIABILITIESScheduleofContractAssetsandLiabilitiesDetails" roleURI="http://www.lockheedmartin.com/role/CONTRACTASSETSANDLIABILITIESScheduleofContractAssetsandLiabilitiesDetails">
        <link:definition>9955527 - Disclosure - CONTRACT ASSETS AND LIABILITIES - Schedule of Contract Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONTRACTASSETSANDLIABILITIESNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/CONTRACTASSETSANDLIABILITIESNarrativeDetails">
        <link:definition>9955528 - Disclosure - CONTRACT ASSETS AND LIABILITIES - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesScheduleofInventoriesDetails" roleURI="http://www.lockheedmartin.com/role/InventoriesScheduleofInventoriesDetails">
        <link:definition>9955529 - Disclosure - Inventories - Schedule of Inventories (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="InventoriesNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/InventoriesNarrativeDetails">
        <link:definition>9955530 - Disclosure - Inventories - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RETIREMENTBENEFITSScheduleofNetPeriodicBenefitCostsDetails" roleURI="http://www.lockheedmartin.com/role/RETIREMENTBENEFITSScheduleofNetPeriodicBenefitCostsDetails">
        <link:definition>9955531 - Disclosure - RETIREMENT BENEFITS - Schedule of Net Periodic Benefit Costs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RETIREMENTBENEFITSNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/RETIREMENTBENEFITSNarrativeDetails">
        <link:definition>9955532 - Disclosure - RETIREMENT BENEFITS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEGALPROCEEDINGSANDCONTINGENCIESDetails" roleURI="http://www.lockheedmartin.com/role/LEGALPROCEEDINGSANDCONTINGENCIESDetails">
        <link:definition>9955533 - Disclosure - LEGAL PROCEEDINGS AND CONTINGENCIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSScheduleofAssetsandLiabilitiesMeasuredandRecordedatFairValueDetails" roleURI="http://www.lockheedmartin.com/role/FAIRVALUEMEASUREMENTSScheduleofAssetsandLiabilitiesMeasuredandRecordedatFairValueDetails">
        <link:definition>9955534 - Disclosure - FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured and Recorded at Fair Value (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FAIRVALUEMEASUREMENTSNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/FAIRVALUEMEASUREMENTSNarrativeDetails">
        <link:definition>9955535 - Disclosure - FAIR VALUE MEASUREMENTS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/STOCKHOLDERSEQUITYNarrativeDetails">
        <link:definition>9955536 - Disclosure - STOCKHOLDERS' EQUITY - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYScheduleofChangesinBalanceofAccumulatedOtherComprehensiveLossNetofIncomeTaxesDetails" roleURI="http://www.lockheedmartin.com/role/STOCKHOLDERSEQUITYScheduleofChangesinBalanceofAccumulatedOtherComprehensiveLossNetofIncomeTaxesDetails">
        <link:definition>9955537 - Disclosure - STOCKHOLDERS' EQUITY - Schedule of Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHERScheduleofContractEstimatesConsolidatedNetProfitBookingRateAdjustmentsDetails" roleURI="http://www.lockheedmartin.com/role/OTHERScheduleofContractEstimatesConsolidatedNetProfitBookingRateAdjustmentsDetails">
        <link:definition>9955538 - Disclosure - OTHER - Schedule of Contract Estimates Consolidated Net Profit Booking Rate Adjustments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHERScheduleofContractEstimatesDetails" roleURI="http://www.lockheedmartin.com/role/OTHERScheduleofContractEstimatesDetails">
        <link:definition>9955539 - Disclosure - OTHER - Schedule of Contract Estimates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHERScheduleofBacklogDetails" roleURI="http://www.lockheedmartin.com/role/OTHERScheduleofBacklogDetails">
        <link:definition>9955540 - Disclosure - OTHER - Schedule of Backlog (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHERScheduleofBacklogDetails_1" roleURI="http://www.lockheedmartin.com/role/OTHERScheduleofBacklogDetails_1">
        <link:definition>9955540 - Disclosure - OTHER - Schedule of Backlog (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OTHERScheduleofIncomeTaxesDetails" roleURI="http://www.lockheedmartin.com/role/OTHERScheduleofIncomeTaxesDetails">
        <link:definition>9955541 - Disclosure - OTHER - Schedule of Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="lmt_OtherUnallocatedIncomeExpense" abstract="false" name="OtherUnallocatedIncomeExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_OtherComprehensiveIncomeLossOtherTax" abstract="false" name="OtherComprehensiveIncomeLossOtherTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_DividendsCashTrueUp" abstract="false" name="DividendsCashTrueUp" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_StockBasedAwardsAndESOPActivity" abstract="false" name="StockBasedAwardsAndESOPActivity" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_ScheduleOfEffectOfProfitBookingRateAdjustmentsTableTextBlock" abstract="false" name="ScheduleOfEffectOfProfitBookingRateAdjustmentsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="lmt_FThirtyFiveProgramMember" abstract="true" name="FThirtyFiveProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_AeronauticsMember" abstract="true" name="AeronauticsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ProgramNetSalesAsPercentOfTotalNetSales" abstract="false" name="ProgramNetSalesAsPercentOfTotalNetSales" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmt_MissilesAndFireControlMember" abstract="true" name="MissilesAndFireControlMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_RotaryAndMissionSystemsMember" abstract="true" name="RotaryAndMissionSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_SpaceMember" abstract="true" name="SpaceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_UnallocatedItemsAbstract" abstract="true" name="UnallocatedItemsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lmt_FasCasOperatingAdjustment" abstract="false" name="FasCasOperatingAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_OtherUnallocatedExpensesNet" abstract="false" name="OtherUnallocatedExpensesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_UnallocatedNet" abstract="false" name="UnallocatedNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_DefinedBenefitPlanCostAccountingStandardsNetPeriodicBenefitCostCredit" abstract="false" name="DefinedBenefitPlanCostAccountingStandardsNetPeriodicBenefitCostCredit" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_FASAndCASPensionAdjustment" abstract="false" name="FASAndCASPensionAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_FinancialAccountingStandardsNonOperatingPensionExpenseIncome" abstract="false" name="FinancialAccountingStandardsNonOperatingPensionExpenseIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_CostReimbursableContractMember" abstract="true" name="CostReimbursableContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_U.S.GovernmentMember" abstract="true" name="U.S.GovernmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_InternationalMember" abstract="true" name="InternationalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_UnitedStatesCommercialAndOtherMember" abstract="true" name="UnitedStatesCommercialAndOtherMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_OtherRegionMember" abstract="true" name="OtherRegionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_F35ProgramAtAeronauticsMember" abstract="true" name="F35ProgramAtAeronauticsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_MissileDefenseProgramsAtMFCMember" abstract="true" name="MissileDefenseProgramsAtMFCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_NewYorkMetropolitanTransportationAuthorityMember" abstract="true" name="NewYorkMetropolitanTransportationAuthorityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ContractValue" abstract="false" name="ContractValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_ContractPaymentsReceivedToDate" abstract="false" name="ContractPaymentsReceivedToDate" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_CounterclaimForDamagesSought" abstract="false" name="CounterclaimForDamagesSought" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_LettersOfCreditAndSuretyBonds" abstract="false" name="LettersOfCreditAndSuretyBonds" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_OtherSecuritiesMember" abstract="true" name="OtherSecuritiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_AccumulatedOtherNetAdjustmentAttributableToParentMember" abstract="true" name="AccumulatedOtherNetAdjustmentAttributableToParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_AccumulatedDefinedBenefitPlansAdjustmentOtherThanPensionAdjustmentsMember" abstract="true" name="AccumulatedDefinedBenefitPlansAdjustmentOtherThanPensionAdjustmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_IncreaseDecreaseInRevenue" abstract="false" name="IncreaseDecreaseInRevenue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_IncreaseDecreaseInOperatingIncomeLoss" abstract="false" name="IncreaseDecreaseInOperatingIncomeLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_IncreaseDecreaseInOperatingIncomeLossPercentage" abstract="false" name="IncreaseDecreaseInOperatingIncomeLossPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmt_IncreaseDecreaseInNetIncomeLossNetOfTax" abstract="false" name="IncreaseDecreaseInNetIncomeLossNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_IncreaseDecreaseInEarningsPerShareDiluted" abstract="false" name="IncreaseDecreaseInEarningsPerShareDiluted" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="lmt_F16ProgramsMember" abstract="true" name="F16ProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_C130ProgramsMember" abstract="true" name="C130ProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_F35ProgramsMember" abstract="true" name="F35ProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ClassifiedProgramMember" abstract="true" name="ClassifiedProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_TurkishUtilityHelicopterProgramMember" abstract="true" name="TurkishUtilityHelicopterProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_CanadianMaritimeHelicopterProgramMember" abstract="true" name="CanadianMaritimeHelicopterProgramMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ContractPhaseAxis" abstract="true" name="ContractPhaseAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="lmt_ContractPhaseDomain" abstract="true" name="ContractPhaseDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_InitialPhaseMember" abstract="true" name="InitialPhaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_OperatingProfitUnfavorableProfitAdjustments" abstract="false" name="OperatingProfitUnfavorableProfitAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_OperatingProfitFavorableProfitAdjustments" abstract="false" name="OperatingProfitFavorableProfitAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_OperatingProfitReachForwardLoss" abstract="false" name="OperatingProfitReachForwardLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_EstimatedCumulativeLosses" abstract="false" name="EstimatedCumulativeLosses" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_ProgramGainsLosses" abstract="false" name="ProgramGainsLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_AdditionalOptionsOfPotentialLosses" abstract="false" name="AdditionalOptionsOfPotentialLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriodAxis" abstract="true" name="RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriodAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="lmt_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriodDomain" abstract="true" name="RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriodDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_PeriodOneMember" abstract="true" name="PeriodOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_PeriodTwoMember" abstract="true" name="PeriodTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
