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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:1b8d4f13-bc0c-43eb-a4e9-8a1fd8cf8b42,g:44b1ae67-74d9-4062-bf45-45b164f5a85c-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:lmt="http://www.lockheedmartin.com/20251231" 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/20251231">
  <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/cyd-af-sub/2025" schemaLocation="https://xbrl.sec.gov/cyd/2025/cyd-af-sub-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-20251231_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-20251231_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-20251231_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-20251231_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="AuditInformation" roleURI="http://www.lockheedmartin.com/role/AuditInformation">
        <link:definition>0000002 - Document - Audit Information</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="OrganizationandSignificantAccountingPolicies" roleURI="http://www.lockheedmartin.com/role/OrganizationandSignificantAccountingPolicies">
        <link:definition>9952159 - Disclosure - Organization and Significant Accounting 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="EarningsPerShare" roleURI="http://www.lockheedmartin.com/role/EarningsPerShare">
        <link:definition>9952160 - Disclosure - Earnings Per 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="ReceivablesnetContractAssetsandContractLiabilities" roleURI="http://www.lockheedmartin.com/role/ReceivablesnetContractAssetsandContractLiabilities">
        <link:definition>9952162 - Disclosure - Receivables, net, Contract Assets and Contract 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="PropertyPlantandEquipmentnet" roleURI="http://www.lockheedmartin.com/role/PropertyPlantandEquipmentnet">
        <link:definition>9952164 - Disclosure - Property, Plant and Equipment, net</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="GoodwillandAcquiredIntangibles" roleURI="http://www.lockheedmartin.com/role/GoodwillandAcquiredIntangibles">
        <link:definition>9952165 - Disclosure - Goodwill and Acquired Intangibles</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="Leases" roleURI="http://www.lockheedmartin.com/role/Leases">
        <link:definition>9952166 - Disclosure - Leases</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="IncomeTaxes" roleURI="http://www.lockheedmartin.com/role/IncomeTaxes">
        <link:definition>9952167 - Disclosure - Income Taxes</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="Debt" roleURI="http://www.lockheedmartin.com/role/Debt">
        <link:definition>9952168 - Disclosure - Debt</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>9952169 - 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="StockholdersEquity" roleURI="http://www.lockheedmartin.com/role/StockholdersEquity">
        <link:definition>9952170 - 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="StockBasedCompensation" roleURI="http://www.lockheedmartin.com/role/StockBasedCompensation">
        <link:definition>9952171 - Disclosure - Stock-Based Compensation</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="LegalProceedingsCommitmentsandContingencies" roleURI="http://www.lockheedmartin.com/role/LegalProceedingsCommitmentsandContingencies">
        <link:definition>9952172 - Disclosure - Legal Proceedings, Commitments 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>9952173 - 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="ImpairmentandOtherCharges" roleURI="http://www.lockheedmartin.com/role/ImpairmentandOtherCharges">
        <link:definition>9952174 - Disclosure - Impairment and Other Charges</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="OrganizationandSignificantAccountingPoliciesPolicies" roleURI="http://www.lockheedmartin.com/role/OrganizationandSignificantAccountingPoliciesPolicies">
        <link:definition>9955511 - Disclosure - Organization and Significant Accounting Policies (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="OrganizationandSignificantAccountingPoliciesTables" roleURI="http://www.lockheedmartin.com/role/OrganizationandSignificantAccountingPoliciesTables">
        <link:definition>9955512 - Disclosure - Organization and Significant Accounting Policies (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="EarningsPerShareTables" roleURI="http://www.lockheedmartin.com/role/EarningsPerShareTables">
        <link:definition>9955513 - Disclosure - Earnings Per 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>9955514 - 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="ReceivablesnetContractAssetsandContractLiabilitiesTables" roleURI="http://www.lockheedmartin.com/role/ReceivablesnetContractAssetsandContractLiabilitiesTables">
        <link:definition>9955515 - Disclosure - Receivables, net, Contract Assets and Contract 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>9955516 - 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="PropertyPlantandEquipmentnetTables" roleURI="http://www.lockheedmartin.com/role/PropertyPlantandEquipmentnetTables">
        <link:definition>9955517 - Disclosure - Property, Plant and Equipment, net (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="GoodwillandAcquiredIntangiblesTables" roleURI="http://www.lockheedmartin.com/role/GoodwillandAcquiredIntangiblesTables">
        <link:definition>9955518 - Disclosure - Goodwill and Acquired Intangibles (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="LeasesTables" roleURI="http://www.lockheedmartin.com/role/LeasesTables">
        <link:definition>9955519 - Disclosure - Leases (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="IncomeTaxesTables" roleURI="http://www.lockheedmartin.com/role/IncomeTaxesTables">
        <link:definition>9955520 - Disclosure - Income Taxes (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="DebtTables" roleURI="http://www.lockheedmartin.com/role/DebtTables">
        <link:definition>9955521 - Disclosure - Debt (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>9955522 - 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="StockholdersEquityTables" roleURI="http://www.lockheedmartin.com/role/StockholdersEquityTables">
        <link:definition>9955523 - 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="StockBasedCompensationTables" roleURI="http://www.lockheedmartin.com/role/StockBasedCompensationTables">
        <link:definition>9955524 - Disclosure - Stock-Based Compensation (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>9955525 - 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="OrganizationandSignificantAccountingPoliciesNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/OrganizationandSignificantAccountingPoliciesNarrativeDetails">
        <link:definition>9955526 - Disclosure - Organization and Significant Accounting Policies - 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="OrganizationandSignificantAccountingPoliciesNarrativeDetails_1" roleURI="http://www.lockheedmartin.com/role/OrganizationandSignificantAccountingPoliciesNarrativeDetails_1">
        <link:definition>9955526 - Disclosure - Organization and Significant Accounting Policies - 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="OrganizationandSignificantAccountingPoliciesScheduleOfEffectOfProfitBookingRateAdjustmentsDetails" roleURI="http://www.lockheedmartin.com/role/OrganizationandSignificantAccountingPoliciesScheduleOfEffectOfProfitBookingRateAdjustmentsDetails">
        <link:definition>9955527 - Disclosure - Organization and Significant Accounting Policies - Schedule Of Effect Of 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="EarningsPerShareScheduleofWeightedAverageSharesOutstandingUsedtoComputeEarningsPerCommonShareDetails" roleURI="http://www.lockheedmartin.com/role/EarningsPerShareScheduleofWeightedAverageSharesOutstandingUsedtoComputeEarningsPerCommonShareDetails">
        <link:definition>9955528 - Disclosure - Earnings Per 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="EarningsPerShareNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/EarningsPerShareNarrativeDetails">
        <link:definition>9955529 - Disclosure - Earnings Per 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>9955530 - 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="InformationonBusinessSegmentsSummaryofFinancialInformationforEachBusinessSegmentDetails" roleURI="http://www.lockheedmartin.com/role/InformationonBusinessSegmentsSummaryofFinancialInformationforEachBusinessSegmentDetails">
        <link:definition>9955531 - Disclosure - Information on Business Segments - Summary 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>9955532 - 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>9955532 - 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>9955533 - 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="InformationonBusinessSegmentsSummaryofFinancialInformationforEachBusinessSegmentIntersegmentSaleDepreciationandCapitalExpendituresDetails" roleURI="http://www.lockheedmartin.com/role/InformationonBusinessSegmentsSummaryofFinancialInformationforEachBusinessSegmentIntersegmentSaleDepreciationandCapitalExpendituresDetails">
        <link:definition>9955534 - Disclosure - Information on Business Segments - Summary of Financial Information for Each Business Segment, Intersegment Sale, Depreciation and Capital Expenditures (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>9955535 - 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="ReceivablesnetContractAssetsandContractLiabilitiesScheduleofReceivablesandContractAssetsandLiabilitiesDetails" roleURI="http://www.lockheedmartin.com/role/ReceivablesnetContractAssetsandContractLiabilitiesScheduleofReceivablesandContractAssetsandLiabilitiesDetails">
        <link:definition>9955536 - Disclosure - Receivables, net, Contract Assets and Contract Liabilities - Schedule of Receivables and 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="ReceivablesnetContractAssetsandContractLiabilitiesNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/ReceivablesnetContractAssetsandContractLiabilitiesNarrativeDetails">
        <link:definition>9955537 - Disclosure - Receivables, net, Contract Assets and Contract 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>9955538 - 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>9955539 - 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="PropertyPlantandEquipmentnetDetails" roleURI="http://www.lockheedmartin.com/role/PropertyPlantandEquipmentnetDetails">
        <link:definition>9955540 - Disclosure - Property, Plant and Equipment, net (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="GoodwillandAcquiredIntangiblesScheduleofChangesintheCarryingAmountofGoodwillbySegmentDetails" roleURI="http://www.lockheedmartin.com/role/GoodwillandAcquiredIntangiblesScheduleofChangesintheCarryingAmountofGoodwillbySegmentDetails">
        <link:definition>9955541 - Disclosure - Goodwill and Acquired Intangibles - Schedule of Changes in the Carrying Amount of Goodwill by 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="GoodwillandAcquiredIntangiblesScheduleofAcquiredIntangibleAssetsDetails" roleURI="http://www.lockheedmartin.com/role/GoodwillandAcquiredIntangiblesScheduleofAcquiredIntangibleAssetsDetails">
        <link:definition>9955542 - Disclosure - Goodwill and Acquired Intangibles - Schedule of Acquired Intangible Assets (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="GoodwillandAcquiredIntangiblesScheduleofAcquiredIntangibleAssetsDetails_1" roleURI="http://www.lockheedmartin.com/role/GoodwillandAcquiredIntangiblesScheduleofAcquiredIntangibleAssetsDetails_1">
        <link:definition>9955542 - Disclosure - Goodwill and Acquired Intangibles - Schedule of Acquired Intangible Assets (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="GoodwillandAcquiredIntangiblesNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/GoodwillandAcquiredIntangiblesNarrativeDetails">
        <link:definition>9955543 - Disclosure - Goodwill and Acquired Intangibles - 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="LeasesNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/LeasesNarrativeDetails">
        <link:definition>9955544 - Disclosure - Leases - 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="LeasesScheduleofFutureMinimumLeaseCommitmentsDetails" roleURI="http://www.lockheedmartin.com/role/LeasesScheduleofFutureMinimumLeaseCommitmentsDetails">
        <link:definition>9955545 - Disclosure - Leases - Schedule of Future Minimum Lease Commitments (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="LeasesScheduleofFutureMinimumLeaseCommitmentsDetails_1" roleURI="http://www.lockheedmartin.com/role/LeasesScheduleofFutureMinimumLeaseCommitmentsDetails_1">
        <link:definition>9955545 - Disclosure - Leases - Schedule of Future Minimum Lease Commitments (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="IncomeTaxesScheduleofIncomeBeforeIncomeTaxExpenseDetails" roleURI="http://www.lockheedmartin.com/role/IncomeTaxesScheduleofIncomeBeforeIncomeTaxExpenseDetails">
        <link:definition>9955546 - Disclosure - Income Taxes - Schedule of Income Before Income Tax Expense (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="IncomeTaxesScheduleofProvisionforFederalForeignIncomeTaxExpenseDetails" roleURI="http://www.lockheedmartin.com/role/IncomeTaxesScheduleofProvisionforFederalForeignIncomeTaxExpenseDetails">
        <link:definition>9955547 - Disclosure - Income Taxes - Schedule of Provision for Federal &amp; Foreign Income Tax Expense (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="IncomeTaxesNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/IncomeTaxesNarrativeDetails">
        <link:definition>9955548 - Disclosure - Income Taxes - 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="IncomeTaxesScheduleofReconciliationofIncomeTaxExpenseComputedUsingUSStatutoryFederalTaxRatetoActualIncomeTaxExpenseDetails" roleURI="http://www.lockheedmartin.com/role/IncomeTaxesScheduleofReconciliationofIncomeTaxExpenseComputedUsingUSStatutoryFederalTaxRatetoActualIncomeTaxExpenseDetails">
        <link:definition>9955549 - Disclosure - Income Taxes - Schedule of Reconciliation of Income Tax Expense Computed Using U.S. Statutory Federal Tax Rate to Actual Income Tax Expense (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="IncomeTaxesScheduleofIncomeTaxesPaidByJurisdictionDetails" roleURI="http://www.lockheedmartin.com/role/IncomeTaxesScheduleofIncomeTaxesPaidByJurisdictionDetails">
        <link:definition>9955550 - Disclosure - Income Taxes - Schedule of Income Taxes Paid By Jurisdiction (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="IncomeTaxesScheduleofUnrecognizedTaxBenefitsRollForwardDetails" roleURI="http://www.lockheedmartin.com/role/IncomeTaxesScheduleofUnrecognizedTaxBenefitsRollForwardDetails">
        <link:definition>9955551 - Disclosure - Income Taxes - Schedule of Unrecognized Tax Benefits Roll Forward (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="IncomeTaxesScheduleofComponentsofFederalandForeignDeferredTaxAssetsandLiabilitiesDetails" roleURI="http://www.lockheedmartin.com/role/IncomeTaxesScheduleofComponentsofFederalandForeignDeferredTaxAssetsandLiabilitiesDetails">
        <link:definition>9955552 - Disclosure - Income Taxes - Schedule of Components of Federal and Foreign Deferred Tax 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="DebtScheduleofLongTermDebtDetails" roleURI="http://www.lockheedmartin.com/role/DebtScheduleofLongTermDebtDetails">
        <link:definition>9955553 - Disclosure - Debt - Schedule of Long Term Debt (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="DebtScheduleofLongTermDebtDetails_1" roleURI="http://www.lockheedmartin.com/role/DebtScheduleofLongTermDebtDetails_1">
        <link:definition>9955553 - Disclosure - Debt - Schedule of Long Term Debt (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="DebtNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/DebtNarrativeDetails">
        <link:definition>9955554 - Disclosure - Debt - 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="RetirementBenefitsNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsNarrativeDetails">
        <link:definition>9955555 - 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="RetirementBenefitsScheduleofNetPeriodicBenefitCostsDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsScheduleofNetPeriodicBenefitCostsDetails">
        <link:definition>9955556 - 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="RetirementBenefitsScheduleofReconciliationofBenefitObligationsPlanAssetsandUnfundedorFundedStatusDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsScheduleofReconciliationofBenefitObligationsPlanAssetsandUnfundedorFundedStatusDetails">
        <link:definition>9955557 - Disclosure - Retirement Benefits - Schedule of Reconciliation of Benefit Obligations, Plan Assets, and Unfunded or Funded Status (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="RetirementBenefitsScheduleofAmountsRecognizedonBalanceSheetsRelatedtoQualifiedDefinedBenefitPensionPlansandRetireeMedicalandLifeInsurancePlansDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsScheduleofAmountsRecognizedonBalanceSheetsRelatedtoQualifiedDefinedBenefitPensionPlansandRetireeMedicalandLifeInsurancePlansDetails">
        <link:definition>9955558 - Disclosure - Retirement Benefits - Schedule of Amounts Recognized on Balance Sheets Related to Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plans (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="RetirementBenefitsScheduleofAccumulatedOtherComprehensiveIncomeLossRelatedtoQualifiedDefinedBenefitPensionandRetireeMedicalandLifeInsurancePlansDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsScheduleofAccumulatedOtherComprehensiveIncomeLossRelatedtoQualifiedDefinedBenefitPensionandRetireeMedicalandLifeInsurancePlansDetails">
        <link:definition>9955559 - Disclosure - Retirement Benefits - Schedule of Accumulated Other Comprehensive Income (Loss) Related to Qualified Defined Benefit Pension and Retiree Medical and Life Insurance Plans (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="RetirementBenefitsScheduleofAmountsRecognizedinOtherComprehensiveIncomeLossRelatedtoPostretirementBenefitPlansNetofTaxDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsScheduleofAmountsRecognizedinOtherComprehensiveIncomeLossRelatedtoPostretirementBenefitPlansNetofTaxDetails">
        <link:definition>9955560 - Disclosure - Retirement Benefits - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) Related to Postretirement Benefit Plans, Net of Tax (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="RetirementBenefitsScheduleofActuarialAssumptionsUsedtoDetermineNetPeriodicBenefitCostDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsScheduleofActuarialAssumptionsUsedtoDetermineNetPeriodicBenefitCostDetails">
        <link:definition>9955561 - Disclosure - Retirement Benefits - Schedule of Actuarial Assumptions Used to Determine Net Periodic Benefit Cost (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="RetirementBenefitsScheduleofAssetAllocationsDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsScheduleofAssetAllocationsDetails">
        <link:definition>9955562 - Disclosure - Retirement Benefits - Schedule of Asset Allocations (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="RetirementBenefitsScheduleofQualifiedDefinedBenefitPensionPlansandRetireeMedicalandLifeInsurancePlansbyAssetCategoryDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsScheduleofQualifiedDefinedBenefitPensionPlansandRetireeMedicalandLifeInsurancePlansbyAssetCategoryDetails">
        <link:definition>9955563 - Disclosure - Retirement Benefits - Schedule of Qualified Defined Benefit Pension Plans and Retiree Medical and Life Insurance Plans by Asset Category (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="RetirementBenefitsScheduleofEstimatedFutureBenefitPaymentsDetails" roleURI="http://www.lockheedmartin.com/role/RetirementBenefitsScheduleofEstimatedFutureBenefitPaymentsDetails">
        <link:definition>9955564 - Disclosure - Retirement Benefits - Schedule of Estimated Future Benefit Payments (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>9955565 - 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>9955566 - 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="StockBasedCompensationNarrativeDetails" roleURI="http://www.lockheedmartin.com/role/StockBasedCompensationNarrativeDetails">
        <link:definition>9955567 - Disclosure - Stock-Based Compensation - 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="StockBasedCompensationSummaryofStockBasedCompensationActivityRelatedtoNonvestedRSUsDetails" roleURI="http://www.lockheedmartin.com/role/StockBasedCompensationSummaryofStockBasedCompensationActivityRelatedtoNonvestedRSUsDetails">
        <link:definition>9955568 - Disclosure - Stock-Based Compensation - Summary of Stock Based Compensation Activity Related to Nonvested RSUs (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="LegalProceedingsCommitmentsandContingenciesDetail" roleURI="http://www.lockheedmartin.com/role/LegalProceedingsCommitmentsandContingenciesDetail">
        <link:definition>9955569 - Disclosure - Legal Proceedings, Commitments and Contingencies (Detail)</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>9955570 - 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>9955571 - 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="ImpairmentandOtherChargesDetails" roleURI="http://www.lockheedmartin.com/role/ImpairmentandOtherChargesDetails">
        <link:definition>9955572 - Disclosure - Impairment and Other Charges (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_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <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_OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossArisingDuringPeriodAndPriorServiceCostCreditAfterTax" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanGainLossArisingDuringPeriodAndPriorServiceCostCreditAfterTax" nillable="true" xbrli:periodType="duration" 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_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_OrganizationPolicyTextBlock" abstract="false" name="OrganizationPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <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_RevenueFromContractWithCustomerNumberOfContractTypes" abstract="false" name="RevenueFromContractWithCustomerNumberOfContractTypes" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <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:element id="lmt_SignificantAccountingPoliciesTable" abstract="true" name="SignificantAccountingPoliciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="lmt_AmentumsRapidSolutionsMember" abstract="true" name="AmentumsRapidSolutionsMember" 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_CanadianMaritimeHelicopterProgramMember" abstract="true" name="CanadianMaritimeHelicopterProgramMember" 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_C130ProgramsMember" abstract="true" name="C130ProgramsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_CommercialCivilSpaceProgramMember" abstract="true" name="CommercialCivilSpaceProgramMember" 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_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_MissilesAndFireControlMember" abstract="true" name="MissilesAndFireControlMember" 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_RestrictedStockUnitsAndPerformanceStockUnitsMember" abstract="true" name="RestrictedStockUnitsAndPerformanceStockUnitsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_SignificantAccountingPoliciesLineItems" abstract="true" name="SignificantAccountingPoliciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <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_OperatingProfitFavorableProfitAdjustments" abstract="false" name="OperatingProfitFavorableProfitAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" 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_AdditionalOptionsOfPotentialLosses" abstract="false" name="AdditionalOptionsOfPotentialLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_EquitySecuritiesFVNIRealizedGainLossNetOfTax" abstract="false" name="EquitySecuritiesFVNIRealizedGainLossNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_EquitySecuritiesFVNIRealizedGainLossNetOfTaxAmountPerShare" abstract="false" name="EquitySecuritiesFVNIRealizedGainLossNetOfTaxAmountPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="lmt_TimePeriodEnvironmentalCostsAndRecoveryOfEnvironmentalCostsAreProjectedOver" abstract="false" name="TimePeriodEnvironmentalCostsAndRecoveryOfEnvironmentalCostsAreProjectedOver" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <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_UnitedLaunchAllianceMember" abstract="true" name="UnitedLaunchAllianceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_DefinedBenefitPlanCostOfProvidingSpecialAndContractualTerminationBenefitsAfterTax" abstract="false" name="DefinedBenefitPlanCostOfProvidingSpecialAndContractualTerminationBenefitsAfterTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_DefinedBenefitPlanCostOfProvidingSpecialAndContractualTerminationBenefitsPerShareAfterTax" abstract="false" name="DefinedBenefitPlanCostOfProvidingSpecialAndContractualTerminationBenefitsPerShareAfterTax" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <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_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_USGovernmentMember" abstract="true" name="USGovernmentMember" 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_OtherGovernmentsAndCommercialMember" abstract="true" name="OtherGovernmentsAndCommercialMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_IncreaseDecreaseInContractWithCustomerAssetGross" abstract="false" name="IncreaseDecreaseInContractWithCustomerAssetGross" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_IncreaseDecreaseInContractWithCustomerLiabilityGross" abstract="false" name="IncreaseDecreaseInContractWithCustomerLiabilityGross" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_SpaceSystemsMember" abstract="true" name="SpaceSystemsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_EffectiveIncomeTaxRateReconciliationTaxContingencyResearchAndDevelopmentTaxCreditAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxContingencyResearchAndDevelopmentTaxCreditAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_EffectiveIncomeTaxRateReconciliationTaxContingencyResearchAndDevelopmentTaxCreditPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxContingencyResearchAndDevelopmentTaxCreditPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="lmt_UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromOtherNet" abstract="false" name="UnrecognizedTaxBenefitsIncreaseDecreaseResultingFromOtherNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_DeferredTaxAssetsContractAccountingMethods" abstract="false" name="DeferredTaxAssetsContractAccountingMethods" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_FourPointNineFivePercentNotesDueTwentyTwentyFiveMember" abstract="true" name="FourPointNineFivePercentNotesDueTwentyTwentyFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ThreePointFiveFivePercentNotesDueTwentyTwentySixMember" abstract="true" name="ThreePointFiveFivePercentNotesDueTwentyTwentySixMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FivePointOneZeroPercentNotesDueTwentyTwentySevenMember" abstract="true" name="FivePointOneZeroPercentNotesDueTwentyTwentySevenMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointFourFivePercentFourPointOneFiveNotesDueTwentyTwentyEightMember" abstract="true" name="FourPointFourFivePercentFourPointOneFiveNotesDueTwentyTwentyEightMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointFiveZeroPercentNotesDueTwentyTwentyNineMember" abstract="true" name="FourPointFiveZeroPercentNotesDueTwentyTwentyNineMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_OnePointEightFivePercentFourPointFourZeroNotesDueTwentyThirtyMember" abstract="true" name="OnePointEightFivePercentFourPointFourZeroNotesDueTwentyThirtyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointSevenZeroPercentNotesDueTwentyThirtyOneMember" abstract="true" name="FourPointSevenZeroPercentNotesDueTwentyThirtyOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ThreePointNineZeroPercentNotesDueTwentyThirtyTwoMember" abstract="true" name="ThreePointNineZeroPercentNotesDueTwentyThirtyTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FivePointTwoFivePercentNotesDueTwentyThirtyThreeMember" abstract="true" name="FivePointTwoFivePercentNotesDueTwentyThirtyThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointSevenFivePercentAndFourPointEightZeroPercentNotesDueTwentyThirtyFourMember" abstract="true" name="FourPointSevenFivePercentAndFourPointEightZeroPercentNotesDueTwentyThirtyFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ThreePointSixZeroPercentFivePointZeroNotesDueTwentyThirtyFiveMember" abstract="true" name="ThreePointSixZeroPercentFivePointZeroNotesDueTwentyThirtyFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointFiveZeroPercentageAndSixPointOneFivePercentDueTwentyThirtySixMember" abstract="true" name="FourPointFiveZeroPercentageAndSixPointOneFivePercentDueTwentyThirtySixMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointZeroSevenPercentNotesDueTwoThousandFortyTwoMember" abstract="true" name="FourPointZeroSevenPercentNotesDueTwoThousandFortyTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ThreePointEightZeroPercentNotesDueTwentyFortyFiveMember" abstract="true" name="ThreePointEightZeroPercentNotesDueTwentyFortyFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointSevenZeroPercentNotesDueTwentyFortySixMember" abstract="true" name="FourPointSevenZeroPercentNotesDueTwentyFortySixMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_TwoPointEightZeroPercentNotesDueTwentyFiftyMember" abstract="true" name="TwoPointEightZeroPercentNotesDueTwentyFiftyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointZeroNinePercentNotesDueTwentyFiftyTwoMember" abstract="true" name="FourPointZeroNinePercentNotesDueTwentyFiftyTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointOneFivePercentNotesDueTwentyFiftyThreeMember" abstract="true" name="FourPointOneFivePercentNotesDueTwentyFiftyThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FivePointSevenZeroPercentNotesDueTwentyFiftyFourMember" abstract="true" name="FivePointSevenZeroPercentNotesDueTwentyFiftyFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FivePointTwoZeroPercentNotesDueTwentyFiftyFiveMember" abstract="true" name="FivePointTwoZeroPercentNotesDueTwentyFiftyFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointThreeZeroPercentNotesDueTwentySixtyTwoMember" abstract="true" name="FourPointThreeZeroPercentNotesDueTwentySixtyTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FivePointNineZeroPercentNotesDueTwentySixtyThreeMember" abstract="true" name="FivePointNineZeroPercentNotesDueTwentySixtyThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FivePointTwoZeroPercentNotesDueTwentySixtyFourMember" abstract="true" name="FivePointTwoZeroPercentNotesDueTwentySixtyFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_OtherNotesFourPointEightFivePercentToNinePointOneThreePercentDueTwoThousandTwentySixToTwoThousandFortyOneMember" abstract="true" name="OtherNotesFourPointEightFivePercentToNinePointOneThreePercentDueTwoThousandTwentySixToTwoThousandFortyOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_A364DayRevolvingCreditAgreementMember" abstract="true" name="A364DayRevolvingCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FiveYearRevolvingCreditFacilityMember" abstract="true" name="FiveYearRevolvingCreditFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointOneFivePercentNotesDueTwentyTwentyEightMember" abstract="true" name="FourPointOneFivePercentNotesDueTwentyTwentyEightMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FivePointFourZeroPercentNotesDueTwentyThirtyMember" abstract="true" name="FivePointFourZeroPercentNotesDueTwentyThirtyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FivePointZeroZeroPercentNotesDueTwentyThirtyFiveMember" abstract="true" name="FivePointZeroZeroPercentNotesDueTwentyThirtyFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_FourPointEightZeroPercentNotesDueTwentyThirtyFourMember" abstract="true" name="FourPointEightZeroPercentNotesDueTwentyThirtyFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_CommingledEquityFundsMember" abstract="true" name="CommingledEquityFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostActualReturnonPlanAssets" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostActualReturnonPlanAssets" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmt_SharesOfOurStockHeldInDefinedContributionPlansWeSponsor" abstract="false" name="SharesOfOurStockHeldInDefinedContributionPlansWeSponsor" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="lmt_DefinedBenefitPlanBenefitObligationDemographicAndAssumptionChangesGainLoss" abstract="false" name="DefinedBenefitPlanBenefitObligationDemographicAndAssumptionChangesGainLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostLongTermRateOfReturnAssumptionPercentage" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostLongTermRateOfReturnAssumptionPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="lmt_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanTax" abstract="false" name="AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanTax" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_OtherComprehensiveIncomeLossDefinedBenefitPlanNetPriorServiceCostCreditReclassificationAdjustmentFromAOCIAfterTax" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanNetPriorServiceCostCreditReclassificationAdjustmentFromAOCIAfterTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansExcludingDiscontinuedOperationsNetOfTax" abstract="false" name="OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansExcludingDiscontinuedOperationsNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_DefinedBenefitPlanCommingledEquityFundsMember" abstract="true" name="DefinedBenefitPlanCommingledEquityFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_OtherFixedIncomeInvestmentsBuyInContractsMember" abstract="true" name="OtherFixedIncomeInvestmentsBuyInContractsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_OtherFixedIncomeInvestmentsMember" abstract="true" name="OtherFixedIncomeInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_LoanNetMember" abstract="true" name="LoanNetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_PayablesReceivablesNetMember" abstract="true" name="PayablesReceivablesNetMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_BuyInContractMember" abstract="true" name="BuyInContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_DefinedBenefitPlanPlanWithBenefitObligationsEqualToPlanAssets" abstract="false" name="DefinedBenefitPlanPlanWithBenefitObligationsEqualToPlanAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_ShareholdersEquityTable" abstract="true" name="ShareholdersEquityTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="lmt_AcceleratedShareRepurchaseAgreementMember" abstract="true" name="AcceleratedShareRepurchaseAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ShareholdersEquityLineItems" abstract="true" name="ShareholdersEquityLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="lmt_StockRepurchaseProgramAuthorizedAmountIncreaseAmount" abstract="false" name="StockRepurchaseProgramAuthorizedAmountIncreaseAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_AccumulatedDefinedBenefitsPlansAdjustmentRecognitionOfSettlementLossMember" abstract="true" name="AccumulatedDefinedBenefitsPlansAdjustmentRecognitionOfSettlementLossMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_AccumulatedDefinedBenefitsPlansAdjustmentNetActuarialLossAttributableToParentMember" abstract="true" name="AccumulatedDefinedBenefitsPlansAdjustmentNetActuarialLossAttributableToParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_AccumulatedDefinedBenefitPlansAdjustmentOtherThanPensionAdjustmentsAttributableToParentMember" abstract="true" name="AccumulatedDefinedBenefitPlansAdjustmentOtherThanPensionAdjustmentsAttributableToParentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationPlansAxis" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationPlansAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="lmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationPlansDomain" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationPlansDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_RemainingHalfOfPSUsGrantedInPeriodMember" abstract="true" name="RemainingHalfOfPSUsGrantedInPeriodMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_RemainingPSUsGrantedInPeriodMember" abstract="true" name="RemainingPSUsGrantedInPeriodMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_CertainEmployeesMember" abstract="true" name="CertainEmployeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="lmt_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedRemainingPeriodForRecognition" abstract="false" name="EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedRemainingPeriodForRecognition" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="lmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardConversionRateOfTargetAward" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardConversionRateOfTargetAward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <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_LettersOfCreditSuretyBondsAndThirdPartyGuarantees" abstract="false" name="LettersOfCreditSuretyBondsAndThirdPartyGuarantees" 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_SeveranceAndRestructuringCostsAfterTax" abstract="false" name="SeveranceAndRestructuringCostsAfterTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="lmt_SeveranceAndRestructuringCostsPerShareAfterTax" abstract="false" name="SeveranceAndRestructuringCostsPerShareAfterTax" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
</xs:schema>
