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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:445bd33f-c876-440c-bc9a-2adb9b0773ab,g:8ab9d247-d99f-45ad-b09f-9282ff541b64-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.northropgrumman.com/role/DocumentandEntityInformationDocument" xlink:type="simple" xlink:href="noc-20210331.xsd#DocumentandEntityInformationDocument"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/DocumentandEntityInformationDocument" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofEarningsandComprehensiveIncomeUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#CondensedConsolidatedStatementsofEarningsandComprehensiveIncomeUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofEarningsandComprehensiveIncomeUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_7e2c8a84-8038-4f32-9faf-7bd97bf732ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_4340d260-bc51-4497-b980-09d140f9f88f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_7e2c8a84-8038-4f32-9faf-7bd97bf732ee" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax_4340d260-bc51-4497-b980-09d140f9f88f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_noc_OtherComprehensiveIncomeLossForeignCurrencyTranslationandTranslationAdjustmentandOtherNetofTax_21b92644-7bd5-4c9f-8347-ec0808acf3e0" xlink:href="noc-20210331.xsd#noc_OtherComprehensiveIncomeLossForeignCurrencyTranslationandTranslationAdjustmentandOtherNetofTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_7e2c8a84-8038-4f32-9faf-7bd97bf732ee" xlink:to="loc_noc_OtherComprehensiveIncomeLossForeignCurrencyTranslationandTranslationAdjustmentandOtherNetofTax_21b92644-7bd5-4c9f-8347-ec0808acf3e0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_60949d36-08ab-4de6-b62c-c963dbcae9dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_4420737f-dda5-4465-81f5-30be70f967b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_60949d36-08ab-4de6-b62c-c963dbcae9dc" xlink:to="loc_us-gaap_NetIncomeLoss_4420737f-dda5-4465-81f5-30be70f967b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_cff5923b-1964-4bc2-bff3-9beb97c28d52" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTax_60949d36-08ab-4de6-b62c-c963dbcae9dc" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_cff5923b-1964-4bc2-bff3-9beb97c28d52" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_c38a75be-a0d0-4de4-a599-587f5f17d022" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_ef07b325-18aa-4885-8eef-29bd4e508b6c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c38a75be-a0d0-4de4-a599-587f5f17d022" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_ef07b325-18aa-4885-8eef-29bd4e508b6c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_86f97645-b8ec-4422-8d8f-0c3223e7e6b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c38a75be-a0d0-4de4-a599-587f5f17d022" xlink:to="loc_us-gaap_Revenues_86f97645-b8ec-4422-8d8f-0c3223e7e6b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_fde6995c-d719-4c06-8c76-73d976a980b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_OperatingIncomeLoss_c38a75be-a0d0-4de4-a599-587f5f17d022" xlink:to="loc_us-gaap_OperatingExpenses_fde6995c-d719-4c06-8c76-73d976a980b7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_6fbc819d-1760-46a3-a26a-71c712d9396c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_e71ea889-8216-4749-a451-242183de1eee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_6fbc819d-1760-46a3-a26a-71c712d9396c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_e71ea889-8216-4749-a451-242183de1eee" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_df368683-3f6d-466f-9443-14ba066afc01" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetIncomeLoss_6fbc819d-1760-46a3-a26a-71c712d9396c" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_df368683-3f6d-466f-9443-14ba066afc01" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8ac0fbf3-d490-40aa-995b-a3f1a26ff7d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_7e17bdf7-172e-4518-86f3-3ec38060cdbd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8ac0fbf3-d490-40aa-995b-a3f1a26ff7d6" xlink:to="loc_us-gaap_OperatingIncomeLoss_7e17bdf7-172e-4518-86f3-3ec38060cdbd" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDebtExpense_146f07bb-895a-4d45-88c1-7a38947aee3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestAndDebtExpense"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8ac0fbf3-d490-40aa-995b-a3f1a26ff7d6" xlink:to="loc_us-gaap_InterestAndDebtExpense_146f07bb-895a-4d45-88c1-7a38947aee3d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_noc_NetFASnonservicePensionBenefitExpense_8f2c30b9-346b-4cea-ba4e-445aed5836f7" xlink:href="noc-20210331.xsd#noc_NetFASnonservicePensionBenefitExpense"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8ac0fbf3-d490-40aa-995b-a3f1a26ff7d6" xlink:to="loc_noc_NetFASnonservicePensionBenefitExpense_8f2c30b9-346b-4cea-ba4e-445aed5836f7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_e8c2a0b3-f017-4c4d-b50b-edb82d7954e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_8ac0fbf3-d490-40aa-995b-a3f1a26ff7d6" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_e8c2a0b3-f017-4c4d-b50b-edb82d7954e5" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofFinancialPositionUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#CondensedConsolidatedStatementsofFinancialPositionUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofFinancialPositionUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_a20bfb4c-8640-411d-b61d-aa1247b142b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_52557fca-4c5c-4aa8-b907-cebb479d983e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_a20bfb4c-8640-411d-b61d-aa1247b142b9" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_52557fca-4c5c-4aa8-b907-cebb479d983e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_6ce36a9e-8a31-4419-be73-16517bdc3f85" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_a20bfb4c-8640-411d-b61d-aa1247b142b9" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_6ce36a9e-8a31-4419-be73-16517bdc3f85" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings_5cc07b64-3e9c-45c4-bb16-bc756e677b4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_a20bfb4c-8640-411d-b61d-aa1247b142b9" xlink:to="loc_us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings_5cc07b64-3e9c-45c4-bb16-bc756e677b4a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_2ca0574c-eddd-49ff-b193-d3af2d70a2de" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_a20bfb4c-8640-411d-b61d-aa1247b142b9" xlink:to="loc_us-gaap_OtherAssetsCurrent_2ca0574c-eddd-49ff-b193-d3af2d70a2de" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_6f82c6a8-1ca8-4f72-8f64-ad1614c86518" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_a20bfb4c-8640-411d-b61d-aa1247b142b9" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_6f82c6a8-1ca8-4f72-8f64-ad1614c86518" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_31e78dbb-42b9-4dde-8c96-7dd15741882a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AssetsCurrent_a20bfb4c-8640-411d-b61d-aa1247b142b9" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_31e78dbb-42b9-4dde-8c96-7dd15741882a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_643107e2-d305-4239-991a-48a75f04b56b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_c6bff5c7-b54a-4d49-8a81-825df18e43b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_643107e2-d305-4239-991a-48a75f04b56b" xlink:to="loc_us-gaap_LiabilitiesCurrent_c6bff5c7-b54a-4d49-8a81-825df18e43b1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_6905d4d1-89e4-4a6e-9d80-fbae9b751516" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_643107e2-d305-4239-991a-48a75f04b56b" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_6905d4d1-89e4-4a6e-9d80-fbae9b751516" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_a33b6133-048b-4568-9330-c0f6f2c566ca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_643107e2-d305-4239-991a-48a75f04b56b" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_a33b6133-048b-4568-9330-c0f6f2c566ca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_93934408-e23a-4e55-b874-d77fa750ac72" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_643107e2-d305-4239-991a-48a75f04b56b" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_93934408-e23a-4e55-b874-d77fa750ac72" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_89ff50fa-46c6-4a6f-8ce7-928bed226616" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_643107e2-d305-4239-991a-48a75f04b56b" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_89ff50fa-46c6-4a6f-8ce7-928bed226616" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_2d4f9d37-e723-4cbd-94ea-34fb37df7cca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Liabilities_643107e2-d305-4239-991a-48a75f04b56b" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_2d4f9d37-e723-4cbd-94ea-34fb37df7cca" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_c036fce0-07af-47e9-834c-77095768b806" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_d669b9bd-9ec7-4a78-8ca3-19c3cdb6b357" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c036fce0-07af-47e9-834c-77095768b806" xlink:to="loc_us-gaap_AssetsCurrent_d669b9bd-9ec7-4a78-8ca3-19c3cdb6b357" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_033b070b-0851-480c-852c-7846387d241a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c036fce0-07af-47e9-834c-77095768b806" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_033b070b-0851-480c-852c-7846387d241a" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_2e534331-c857-49d7-88ff-bc971a0cdf13" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c036fce0-07af-47e9-834c-77095768b806" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_2e534331-c857-49d7-88ff-bc971a0cdf13" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_31028aea-488f-440c-b151-7ab638b08942" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c036fce0-07af-47e9-834c-77095768b806" xlink:to="loc_us-gaap_Goodwill_31028aea-488f-440c-b151-7ab638b08942" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_457a8b57-10ae-4696-8b2d-6338d754446e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c036fce0-07af-47e9-834c-77095768b806" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_457a8b57-10ae-4696-8b2d-6338d754446e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_14d3f39c-068c-4ae6-a562-7b854b6731c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:calculationArc order="6" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c036fce0-07af-47e9-834c-77095768b806" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_14d3f39c-068c-4ae6-a562-7b854b6731c8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_226fd17f-e5f6-4544-9272-eb7551211cf0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:calculationArc order="7" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_Assets_c036fce0-07af-47e9-834c-77095768b806" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_226fd17f-e5f6-4544-9272-eb7551211cf0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_395b54d3-dc47-4e1f-906b-3d4d406aeff6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_e852c4e2-c6a3-4504-b08f-455ae8d970a0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PreferredStockValue"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_395b54d3-dc47-4e1f-906b-3d4d406aeff6" xlink:to="loc_us-gaap_PreferredStockValue_e852c4e2-c6a3-4504-b08f-455ae8d970a0" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_97dfb323-ae8b-4abd-b90d-44c8f99e5321" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_395b54d3-dc47-4e1f-906b-3d4d406aeff6" xlink:to="loc_us-gaap_CommonStockValue_97dfb323-ae8b-4abd-b90d-44c8f99e5321" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_a0433180-bd10-4a89-9cf5-a556be2e5f25" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_395b54d3-dc47-4e1f-906b-3d4d406aeff6" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_a0433180-bd10-4a89-9cf5-a556be2e5f25" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_7db0915f-c599-40d9-8abb-60b2481a109d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_395b54d3-dc47-4e1f-906b-3d4d406aeff6" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_7db0915f-c599-40d9-8abb-60b2481a109d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_f37b3be5-1ea2-484e-a6a6-5a50bd603528" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_StockholdersEquity_395b54d3-dc47-4e1f-906b-3d4d406aeff6" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_f37b3be5-1ea2-484e-a6a6-5a50bd603528" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_20d26714-2ae5-413c-bae3-c5001f29135a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_b123db08-9df8-4365-b7f1-17496f25b3f3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_20d26714-2ae5-413c-bae3-c5001f29135a" xlink:to="loc_us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent_b123db08-9df8-4365-b7f1-17496f25b3f3" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_7d830a46-f189-4fd1-a408-8924baf6abf8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_20d26714-2ae5-413c-bae3-c5001f29135a" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_7d830a46-f189-4fd1-a408-8924baf6abf8" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_1c1d368c-d3b9-4646-ac1f-e7acf9ab49d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_20d26714-2ae5-413c-bae3-c5001f29135a" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_1c1d368c-d3b9-4646-ac1f-e7acf9ab49d6" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_8ae2f67b-c225-4ad4-adf3-7801dcd9769c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_20d26714-2ae5-413c-bae3-c5001f29135a" xlink:to="loc_us-gaap_AccountsPayableCurrent_8ae2f67b-c225-4ad4-adf3-7801dcd9769c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_2990fd14-f701-467f-83fb-39ee49097f1c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesCurrent_20d26714-2ae5-413c-bae3-c5001f29135a" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_2990fd14-f701-467f-83fb-39ee49097f1c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_bc484543-ec54-48bf-9ce8-3ebbbd9e4397" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_5621fd03-d16d-4994-958b-fe2077934d0d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_bc484543-ec54-48bf-9ce8-3ebbbd9e4397" xlink:to="loc_us-gaap_Liabilities_5621fd03-d16d-4994-958b-fe2077934d0d" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_a0349690-a9ce-468f-855f-00076e6244a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquity_bc484543-ec54-48bf-9ce8-3ebbbd9e4397" xlink:to="loc_us-gaap_StockholdersEquity_a0349690-a9ce-468f-855f-00076e6244a4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofFinancialPositionUnauditedParentheticals" xlink:type="simple" xlink:href="noc-20210331.xsd#CondensedConsolidatedStatementsofFinancialPositionUnauditedParentheticals"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofFinancialPositionUnauditedParentheticals" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofCashFlowsUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#CondensedConsolidatedStatementsofCashFlowsUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofCashFlowsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d55ba03b-1132-4b60-b5c1-744f82b0495f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_22c32633-6c4f-48f1-81d5-bfaaf60fd917" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d55ba03b-1132-4b60-b5c1-744f82b0495f" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_22c32633-6c4f-48f1-81d5-bfaaf60fd917" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_49aa09d2-8041-4f29-a9f2-65ca2c974302" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d55ba03b-1132-4b60-b5c1-744f82b0495f" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_49aa09d2-8041-4f29-a9f2-65ca2c974302" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_7cb2e941-b346-4546-b250-dee5aec3f3e7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d55ba03b-1132-4b60-b5c1-744f82b0495f" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_7cb2e941-b346-4546-b250-dee5aec3f3e7" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_7fe0584f-c397-4c1e-b646-129e89ae7d34" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfCommercialPaper"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d55ba03b-1132-4b60-b5c1-744f82b0495f" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_7fe0584f-c397-4c1e-b646-129e89ae7d34" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_1c09cd86-5c23-4310-ad5c-2f657ab98c7f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:calculationArc order="5" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d55ba03b-1132-4b60-b5c1-744f82b0495f" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_1c09cd86-5c23-4310-ad5c-2f657ab98c7f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_6857a4e3-10ef-4ad3-bb01-9f7733bfd817" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d55ba03b-1132-4b60-b5c1-744f82b0495f" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_6857a4e3-10ef-4ad3-bb01-9f7733bfd817" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_e0bddc8e-f3be-4d07-a9a0-1b04812a1ddb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d55ba03b-1132-4b60-b5c1-744f82b0495f" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_e0bddc8e-f3be-4d07-a9a0-1b04812a1ddb" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_f8d60303-0ef5-4957-8570-296749e0c47c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:calculationArc order="8" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_d55ba03b-1132-4b60-b5c1-744f82b0495f" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_f8d60303-0ef5-4957-8570-296749e0c47c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1de0da1e-d024-47d1-9181-b4aad0fd0faa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_a02bd69c-da9f-4f60-a58f-ad17e02a487b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1de0da1e-d024-47d1-9181-b4aad0fd0faa" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_a02bd69c-da9f-4f60-a58f-ad17e02a487b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_aaf29650-4b5d-441d-a706-d96d3d7af194" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1de0da1e-d024-47d1-9181-b4aad0fd0faa" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_aaf29650-4b5d-441d-a706-d96d3d7af194" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_5dddaad4-fbb8-476b-92a5-8046ed6e267c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_1de0da1e-d024-47d1-9181-b4aad0fd0faa" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_5dddaad4-fbb8-476b-92a5-8046ed6e267c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_836aa6fc-923c-400d-81ae-3c7190daa688" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_663ff48b-1d58-440b-b73f-2d6dc393f365" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_836aa6fc-923c-400d-81ae-3c7190daa688" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_663ff48b-1d58-440b-b73f-2d6dc393f365" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_43d2e67c-85bd-45a9-8489-c4b54d022dbc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_836aa6fc-923c-400d-81ae-3c7190daa688" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_43d2e67c-85bd-45a9-8489-c4b54d022dbc" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_653c79b9-4384-4112-bc7b-da9c64b438f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_836aa6fc-923c-400d-81ae-3c7190daa688" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_653c79b9-4384-4112-bc7b-da9c64b438f2" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_920aeba2-e154-4332-b15c-a75a94bb1d53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_NetIncomeLoss_920aeba2-e154-4332-b15c-a75a94bb1d53" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_65bc518b-8fad-4edb-a055-48aee3bc2072" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:calculationArc order="2" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_65bc518b-8fad-4edb-a055-48aee3bc2072" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_12242103-0a35-4e8f-87a5-f761f4591e3f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:calculationArc order="3" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_12242103-0a35-4e8f-87a5-f761f4591e3f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_b7da2d38-cc96-435f-bb0d-be04ca779329" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_ShareBasedCompensation_b7da2d38-cc96-435f-bb0d-be04ca779329" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_cd3bfddb-7366-4871-a29a-cce1813d72d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:calculationArc order="5" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_cd3bfddb-7366-4871-a29a-cce1813d72d5" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_9f3b1069-12e6-4188-b600-9221c8929c65" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:calculationArc order="6" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_9f3b1069-12e6-4188-b600-9221c8929c65" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_9b159cd8-ce1a-4591-a141-19d794b34f51" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerAsset"/>
    <link:calculationArc order="7" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerAsset_9b159cd8-ce1a-4591-a141-19d794b34f51" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_ff2348fd-3060-4251-a338-6db5e55e6e9f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:calculationArc order="8" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_ff2348fd-3060-4251-a338-6db5e55e6e9f" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_a9189cb9-1c58-4035-92be-e60152c72086" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:calculationArc order="9" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_a9189cb9-1c58-4035-92be-e60152c72086" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_6cd0a494-e521-4b79-8d5d-f0208c72c23c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:calculationArc order="10" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_6cd0a494-e521-4b79-8d5d-f0208c72c23c" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_08a2f413-3a97-4947-8c23-9577b6ec146b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable"/>
    <link:calculationArc order="11" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_08a2f413-3a97-4947-8c23-9577b6ec146b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_23cbabdf-9c6f-4034-b93b-c957653daab1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations"/>
    <link:calculationArc order="12" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_23cbabdf-9c6f-4034-b93b-c957653daab1" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_b04da97f-2488-4735-904f-9b2cb23f046a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:calculationArc order="13" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_20431e72-997a-48c5-81f2-e11e4bc737a5" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_b04da97f-2488-4735-904f-9b2cb23f046a" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofChangesinShareholdersEquityUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#CondensedConsolidatedStatementsofChangesinShareholdersEquityUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/CondensedConsolidatedStatementsofChangesinShareholdersEquityUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/BasisofPresentationUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#BasisofPresentationUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/BasisofPresentationUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="noc-20210331.xsd#SummaryofSignificantAccountingPoliciesPolicies"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/BasisofPresentationUnauditedTables" xlink:type="simple" xlink:href="noc-20210331.xsd#BasisofPresentationUnauditedTables"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/BasisofPresentationUnauditedTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/BasisofPresentationUnauditedSaleofourITandmissionsupportservicesbusinessDetails1" xlink:type="simple" xlink:href="noc-20210331.xsd#BasisofPresentationUnauditedSaleofourITandmissionsupportservicesbusinessDetails1"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/BasisofPresentationUnauditedSaleofourITandmissionsupportservicesbusinessDetails1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/BasisofPresentationUnauditedContractEstimatesDetails2" xlink:type="simple" xlink:href="noc-20210331.xsd#BasisofPresentationUnauditedContractEstimatesDetails2"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/BasisofPresentationUnauditedContractEstimatesDetails2" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/BasisofPresentationUnauditedBacklogandContractAssetsandLiabilitiesDetails3" xlink:type="simple" xlink:href="noc-20210331.xsd#BasisofPresentationUnauditedBacklogandContractAssetsandLiabilitiesDetails3"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/BasisofPresentationUnauditedBacklogandContractAssetsandLiabilitiesDetails3" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/BasisofPresentationUnauditedPropertyPlantandEquipmentDetails4" xlink:type="simple" xlink:href="noc-20210331.xsd#BasisofPresentationUnauditedPropertyPlantandEquipmentDetails4"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/BasisofPresentationUnauditedPropertyPlantandEquipmentDetails4" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/BasisofPresentationUnauditedAccumulatedOtherComprehensiveIncomeLossDetails5" xlink:type="simple" xlink:href="noc-20210331.xsd#BasisofPresentationUnauditedAccumulatedOtherComprehensiveIncomeLossDetails5"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/BasisofPresentationUnauditedAccumulatedOtherComprehensiveIncomeLossDetails5" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_f051e93a-36eb-473c-b91b-ae257c697316" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_ca5f4d89-bef6-43ff-90b1-cc2f5452379e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax"/>
    <link:calculationArc order="1" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_f051e93a-36eb-473c-b91b-ae257c697316" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax_ca5f4d89-bef6-43ff-90b1-cc2f5452379e" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_760b6aff-7a3c-47a8-b868-8daeb276414b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_f051e93a-36eb-473c-b91b-ae257c697316" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax_760b6aff-7a3c-47a8-b868-8daeb276414b" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/EarningsPerShareShareRepurchasesandDividendsonCommonStockUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#EarningsPerShareShareRepurchasesandDividendsonCommonStockUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/EarningsPerShareShareRepurchasesandDividendsonCommonStockUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/EarningsPerShareShareRepurchasesandDividendsonCommonStockUnauditedTables" xlink:type="simple" xlink:href="noc-20210331.xsd#EarningsPerShareShareRepurchasesandDividendsonCommonStockUnauditedTables"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/EarningsPerShareShareRepurchasesandDividendsonCommonStockUnauditedTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/EarningsPerShareShareRepurchasesandDividendsonCommonStockUnauditedEarningsPerShareandDividendsDetails1" xlink:type="simple" xlink:href="noc-20210331.xsd#EarningsPerShareShareRepurchasesandDividendsonCommonStockUnauditedEarningsPerShareandDividendsDetails1"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/EarningsPerShareShareRepurchasesandDividendsonCommonStockUnauditedEarningsPerShareandDividendsDetails1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/EarningsPerShareShareRepurchasesandDividendsonCommonStockUnauditedShareRepurchasesDetails2" xlink:type="simple" xlink:href="noc-20210331.xsd#EarningsPerShareShareRepurchasesandDividendsonCommonStockUnauditedShareRepurchasesDetails2"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/EarningsPerShareShareRepurchasesandDividendsonCommonStockUnauditedShareRepurchasesDetails2" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/IncomeTaxesUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#IncomeTaxesUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/IncomeTaxesUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/IncomeTaxesUnauditedTables" xlink:type="simple" xlink:href="noc-20210331.xsd#IncomeTaxesUnauditedTables"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/IncomeTaxesUnauditedTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/IncomeTaxesUnauditedEffectiveIncomeTaxRateReconciliationDetails1" xlink:type="simple" xlink:href="noc-20210331.xsd#IncomeTaxesUnauditedEffectiveIncomeTaxRateReconciliationDetails1"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/IncomeTaxesUnauditedEffectiveIncomeTaxRateReconciliationDetails1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/IncomeTaxesUnauditedUnrecognizedTaxBenefitDetails2" xlink:type="simple" xlink:href="noc-20210331.xsd#IncomeTaxesUnauditedUnrecognizedTaxBenefitDetails2"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/IncomeTaxesUnauditedUnrecognizedTaxBenefitDetails2" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/FairValueofFinancialInstrumentsUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#FairValueofFinancialInstrumentsUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/FairValueofFinancialInstrumentsUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/FairValueofFinancialInstrumentsUnauditedTables" xlink:type="simple" xlink:href="noc-20210331.xsd#FairValueofFinancialInstrumentsUnauditedTables"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/FairValueofFinancialInstrumentsUnauditedTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/FairValueofFinancialInstrumentsUnauditedDetails1" xlink:type="simple" xlink:href="noc-20210331.xsd#FairValueofFinancialInstrumentsUnauditedDetails1"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/FairValueofFinancialInstrumentsUnauditedDetails1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/AmountsinParagraphsFairValueofFinancialInstrumentsUnauditedDetails2" xlink:type="simple" xlink:href="noc-20210331.xsd#AmountsinParagraphsFairValueofFinancialInstrumentsUnauditedDetails2"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/AmountsinParagraphsFairValueofFinancialInstrumentsUnauditedDetails2" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/FairValueofFinancialInstrumentsUnauditedLongtermDebtDetails3" xlink:type="simple" xlink:href="noc-20210331.xsd#FairValueofFinancialInstrumentsUnauditedLongtermDebtDetails3"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/FairValueofFinancialInstrumentsUnauditedLongtermDebtDetails3" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/InvestigationsClaimsandLitigationUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#InvestigationsClaimsandLitigationUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/InvestigationsClaimsandLitigationUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/InvestigationsClaimsandLitigationUnauditedDetails" xlink:type="simple" xlink:href="noc-20210331.xsd#InvestigationsClaimsandLitigationUnauditedDetails"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/InvestigationsClaimsandLitigationUnauditedDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/CommitmentsandContingenciesUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#CommitmentsandContingenciesUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/CommitmentsandContingenciesUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/CommitmentsandContingenciesUnauditedTables" xlink:type="simple" xlink:href="noc-20210331.xsd#CommitmentsandContingenciesUnauditedTables"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/CommitmentsandContingenciesUnauditedTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/CommitmentsandContingenciesUnauditedDetails" xlink:type="simple" xlink:href="noc-20210331.xsd#CommitmentsandContingenciesUnauditedDetails"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/CommitmentsandContingenciesUnauditedDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/RetirementBenefitsUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#RetirementBenefitsUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/RetirementBenefitsUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/RetirementBenefitsUnauditedTables" xlink:type="simple" xlink:href="noc-20210331.xsd#RetirementBenefitsUnauditedTables"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/RetirementBenefitsUnauditedTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/RetirementBenefitsUnauditedDetails" xlink:type="simple" xlink:href="noc-20210331.xsd#RetirementBenefitsUnauditedDetails"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/RetirementBenefitsUnauditedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_f87bb4a6-a65d-46db-9cc9-d99f656bbe4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_72ef0593-a85b-4006-839e-048d60ecc65b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:calculationArc order="1" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_f87bb4a6-a65d-46db-9cc9-d99f656bbe4d" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_72ef0593-a85b-4006-839e-048d60ecc65b" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_1ddd8417-c040-45ab-85eb-530b8202eef4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:calculationArc order="2" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_f87bb4a6-a65d-46db-9cc9-d99f656bbe4d" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_1ddd8417-c040-45ab-85eb-530b8202eef4" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_63e1f101-8d64-47e2-a588-3fa34a09b346" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:calculationArc order="3" weight="-1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_f87bb4a6-a65d-46db-9cc9-d99f656bbe4d" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_63e1f101-8d64-47e2-a588-3fa34a09b346" xlink:type="arc"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_784e8ecb-73c3-4e61-a185-bb0514c915d4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:calculationArc order="4" weight="1.0" xlink:arcrole="http://www.xbrl.org/2003/arcrole/summation-item" xlink:from="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_f87bb4a6-a65d-46db-9cc9-d99f656bbe4d" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_784e8ecb-73c3-4e61-a185-bb0514c915d4" xlink:type="arc"/>
  </link:calculationLink>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/StockCompensationPlansandOtherCompensationArrangementsUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#StockCompensationPlansandOtherCompensationArrangementsUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/StockCompensationPlansandOtherCompensationArrangementsUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/StockCompensationPlansandOtherCompensationArrangementsUnauditedTables" xlink:type="simple" xlink:href="noc-20210331.xsd#StockCompensationPlansandOtherCompensationArrangementsUnauditedTables"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/StockCompensationPlansandOtherCompensationArrangementsUnauditedTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/StockCompensationPlansandOtherCompensationArrangementsUnauditedDetails" xlink:type="simple" xlink:href="noc-20210331.xsd#StockCompensationPlansandOtherCompensationArrangementsUnauditedDetails"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/StockCompensationPlansandOtherCompensationArrangementsUnauditedDetails" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/SegmentInformationUnaudited" xlink:type="simple" xlink:href="noc-20210331.xsd#SegmentInformationUnaudited"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/SegmentInformationUnaudited" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/SegmentInformationUnauditedTables" xlink:type="simple" xlink:href="noc-20210331.xsd#SegmentInformationUnauditedTables"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/SegmentInformationUnauditedTables" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/SegmentInformationUnauditedReconciliationtoConsolidatedOperatingIncomeDetails1" xlink:type="simple" xlink:href="noc-20210331.xsd#SegmentInformationUnauditedReconciliationtoConsolidatedOperatingIncomeDetails1"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/SegmentInformationUnauditedReconciliationtoConsolidatedOperatingIncomeDetails1" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/SegmentInformationUnauditedSalesbyCustomerTypeDetails2" xlink:type="simple" xlink:href="noc-20210331.xsd#SegmentInformationUnauditedSalesbyCustomerTypeDetails2"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/SegmentInformationUnauditedSalesbyCustomerTypeDetails2" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/SegmentInformationUnauditedSalesbyContractTypeDetails3" xlink:type="simple" xlink:href="noc-20210331.xsd#SegmentInformationUnauditedSalesbyContractTypeDetails3"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/SegmentInformationUnauditedSalesbyContractTypeDetails3" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/SegmentInformationUnauditedSalesbyGeographicLocationDetails4" xlink:type="simple" xlink:href="noc-20210331.xsd#SegmentInformationUnauditedSalesbyGeographicLocationDetails4"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/SegmentInformationUnauditedSalesbyGeographicLocationDetails4" xlink:type="extended"/>
  <link:roleRef roleURI="http://www.northropgrumman.com/role/SegmentInformationUnauditedUnallocatedCorporateIncomeDetails5" xlink:type="simple" xlink:href="noc-20210331.xsd#SegmentInformationUnauditedUnallocatedCorporateIncomeDetails5"/>
  <link:calculationLink xlink:role="http://www.northropgrumman.com/role/SegmentInformationUnauditedUnallocatedCorporateIncomeDetails5" xlink:type="extended"/>
</link:linkbase>
