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>0001610493</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>Hammes Eric 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 St</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>2224</noOfUnitsSold>
        <aggregateMarketValue>220309.86</aggregateMarketValue>
        <noOfUnitsOutstanding>551992430</noOfUnitsOutstanding>
        <approxSaleDate>08/25/2023</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/31/2022</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>35</amountOfSecuritiesAcquired>
        <paymentDate>01/31/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/28/2022</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>37</amountOfSecuritiesAcquired>
        <paymentDate>02/28/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/31/2022</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>87</amountOfSecuritiesAcquired>
        <paymentDate>03/31/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/31/2023</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>50</amountOfSecuritiesAcquired>
        <paymentDate>01/31/2023</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/28/2023</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>53</amountOfSecuritiesAcquired>
        <paymentDate>02/28/2023</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/31/2023</acquiredDate>
        <natureOfAcquisitionTransaction>ESPP</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>114</amountOfSecuritiesAcquired>
        <paymentDate>03/31/2023</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/31/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1848</amountOfSecuritiesAcquired>
        <paymentDate>05/31/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>08/25/2023</noticeDate>
        <signature>/s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Eric Hammes</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 5917}]
text: 144
  0001610493
  XXXXXXXX
  LIVE
  0000066740
  3M CO
  001-03285
  3M CENTER
  BLDG. 220-13E-26A
  ST PAUL
  MN
  55144-1000
  6517331474
  Hammes Eric D.
  Former Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem St
  Smithfield
  RI
  02917
  2224
  220309.86
  551992430
  08/25/2023
  NYSE
  Common
  01/31/2022
  ESPP
  Issuer
  N
  35
  01/31/2022
  Cash
  Common
  02/28/2022
  ESPP
  Issuer
  N
  37
  02/28/2022
  Cash
  Common
  03/31/2022
  ESPP
  Issuer
  N
  87
  03/31/2022
  Cash
  Common
  01/31/2023
  ESPP
  Issuer
  N
  50
  01/31/2023
  Cash
  Common
  02/28/2023
  ESPP
  Issuer
  N
  53
  02/28/2023
  Cash
  Common
  03/31/2023
  ESPP
  Issuer
  N
  114
  03/31/2023
  Cash
  Common
  05/31/2023
  Restricted Stock Vesting
  Issuer
  N
  1848
  05/31/2023
  Compensation
  Y
  08/25/2023
  /s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Eric Hammes