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        <filer>
          <filerCredentials>
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            <ccc>XXXXXXXX</ccc>
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        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
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      <issuerInfo>
        <issuerCik>0000049826</issuerCik>
        <issuerName>ILLINOIS TOOL WORKS INC</issuerName>
        <secFileNumber>001-04797</secFileNumber>
        <issuerAddress>
          <com:street1>155 HARLEM AVENUE</com:street1>
          <com:city>GLENVIEW</com:city>
          <com:stateOrCountry>IL</com:stateOrCountry>
          <com:zipCode>60025</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>8477247500</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Schott Jennifer Kaplan</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Former Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>3559</noOfUnitsSold>
        <aggregateMarketValue>871955.00</aggregateMarketValue>
        <noOfUnitsOutstanding>293000000</noOfUnitsOutstanding>
        <approxSaleDate>05/08/2025</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/08/2025</acquiredDate>
        <natureOfAcquisitionTransaction>Option Granted - 02/11/2022</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3559</amountOfSecuritiesAcquired>
        <paymentDate>05/08/2025</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
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          <name>Jennifer K. Schott</name>
          <address>
            <com:street1>155 Harlem Avenue</com:street1>
            <com:city>Glenview</com:city>
            <com:stateOrCountry>IL</com:stateOrCountry>
            <com:zipCode>60025</com:zipCode>
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        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>04/09/2025</saleDate>
        <amountOfSecuritiesSold>3500</amountOfSecuritiesSold>
        <grossProceeds>822500.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>05/08/2025</noticeDate>
        <signature>/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jennifer K Schott </signature>
      </noticeSignature>
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text: 144
  0001876104
  XXXXXXXX
  LIVE
  0000049826
  ILLINOIS TOOL WORKS INC
  001-04797
  155 HARLEM AVENUE
  GLENVIEW
  IL
  60025
  8477247500
  Schott Jennifer Kaplan
  Former Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  3559
  871955.00
  293000000
  05/08/2025
  NYSE
  Common
  05/08/2025
  Option Granted - 02/11/2022
  Issuer
  N
  3559
  05/08/2025
  Cash
  N
  Jennifer K. Schott
  155 Harlem Avenue
  Glenview
  IL
  60025
  Common
  04/09/2025
  3500
  822500.00
  05/08/2025
  /s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jennifer K Schott