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>0001741178</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000916076</issuerCik>
        <issuerName>MARTIN MARIETTA MATERIALS INC</issuerName>
        <secFileNumber>001-12744</secFileNumber>
        <issuerAddress>
          <com:street1>4123 PARKLAKE AVE</com:street1>
          <com:city>RALEIGH</com:city>
          <com:stateOrCountry>NC</com:stateOrCountry>
          <com:zipCode>27612</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>919-781-4550</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Davis Smith W</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Former Director</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Martin Marietta Materials, Inc.</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Investments</name>
          <address>
            <com:street1>100 Summer Street</com:street1>
            <com:city>Boston</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>02210</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>2810</noOfUnitsSold>
        <aggregateMarketValue>1145974.20</aggregateMarketValue>
        <noOfUnitsOutstanding>61968757</noOfUnitsOutstanding>
        <approxSaleDate>05/19/2023</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>05/11/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Distribution of deferred restricted stock awards</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Martin Marietta Materials, Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2810</amountOfSecuritiesAcquired>
        <paymentDate>05/11/2023</paymentDate>
        <natureOfPayment>N/A</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <remarks>Common stock units were acquired under the Martin Marietta Materials, Inc. Amended and Restated Stock Based Award Plan and were settled in a lump sum on the date the reporting person ceased to be a Non-Employee Director.</remarks>
      <noticeSignature>
        <noticeDate>05/19/2023</noticeDate>
        <signature>Roselyn R, Bar, Attorney-in-Fact</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3047}]
text: 144
  0001741178
  XXXXXXXX
  LIVE
  0000916076
  MARTIN MARIETTA MATERIALS INC
  001-12744
  4123 PARKLAKE AVE
  RALEIGH
  NC
  27612
  919-781-4550
  Davis Smith W
  Former Director
  Martin Marietta Materials, Inc.
  Fidelity Investments
  100 Summer Street
  Boston
  MA
  02210
  2810
  1145974.20
  61968757
  05/19/2023
  NYSE
  Common Stock
  05/11/2023
  Distribution of deferred restricted stock awards
  Martin Marietta Materials, Inc.
  N
  2810
  05/11/2023
  N/A
  Y
  Common stock units were acquired under the Martin Marietta Materials, Inc. Amended and Restated Stock Based Award Plan and were settled in a lump sum on the date the reporting person ceased to be a Non-Employee Director.
  05/19/2023
  Roselyn R, Bar, Attorney-in-Fact