content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001815253</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000066740</issuerCik>
        <issuerName>3M CO</issuerName>
        <secFileNumber>001-03285</secFileNumber>
        <issuerAddress>
          <com:street1>3M CENTER</com:street1>
          <com:street2>BLDG. 220-13E-26A</com:street2>
          <com:city>ST PAUL</com:city>
          <com:stateOrCountry>MN</com:stateOrCountry>
          <com:zipCode>55144-1000</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>6517331474</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Patolawala Monish D</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>10000</noOfUnitsSold>
        <aggregateMarketValue>1268500.00</aggregateMarketValue>
        <noOfUnitsOutstanding>549353621</noOfUnitsOutstanding>
        <approxSaleDate>08/20/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/20/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Options Granted - 02/07/2023</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>10000</amountOfSecuritiesAcquired>
        <paymentDate>08/20/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>08/20/2024</noticeDate>
        <signature>/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for  Monish Patolawala </signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 2872}]
text: 144
  0001815253
  XXXXXXXX
  LIVE
  0000066740
  3M CO
  001-03285
  3M CENTER
  BLDG. 220-13E-26A
  ST PAUL
  MN
  55144-1000
  6517331474
  Patolawala Monish D
  Former Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  10000
  1268500.00
  549353621
  08/20/2024
  NYSE
  Common
  08/20/2024
  Options Granted - 02/07/2023
  Issuer
  N
  10000
  08/20/2024
  Cash
  Y
  08/20/2024
  /s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for  Monish Patolawala