<?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>0001706490</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000073309</issuerCik>
      <issuerName>NUCOR CORP</issuerName>
      <secFileNumber>001-04119</secFileNumber>
      <issuerAddress>
        <com:street1>1915 REXFORD RD</com:street1>
        <com:city>CHARLOTTE</com:city>
        <com:stateOrCountry>NC</com:stateOrCountry>
        <com:zipCode>28211</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>7043667000</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Topalian Leon J</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
        <relationshipToIssuer>Director</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>27359</noOfUnitsSold>
      <aggregateMarketValue>4601616.89</aggregateMarketValue>
      <noOfUnitsOutstanding>251222908</noOfUnitsOutstanding>
      <approxSaleDate>07/27/2023</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/01/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>2716</amountOfSecuritiesAcquired>
      <paymentDate>06/01/2022</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/10/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Long Term Incentive Program</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>14143</amountOfSecuritiesAcquired>
      <paymentDate>03/10/2023</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/14/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Long Term Incentive Program</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3000</amountOfSecuritiesAcquired>
      <paymentDate>03/14/2023</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>07/27/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Options Granted - 06/01/2020</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>7500</amountOfSecuritiesAcquired>
      <paymentDate>07/27/2023</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>07/27/2023</noticeDate>
      <signature>/s/ Ryan Riviere, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Leon Topalian</signature>
    </noticeSignature>
  </formData>
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144
0001706490
XXXXXXXX
LIVE
0000073309
NUCOR CORP
001-04119
1915 REXFORD RD
CHARLOTTE
NC
28211
7043667000
Topalian Leon J
Officer
Director
Common
Fidelity Brokerage Services LLC
900 Salem Street
Smithfield
RI
02917
27359
4601616.89
251222908
07/27/2023
NYSE
Common
06/01/2022
Restricted Stock Vesting
Issuer
N
2716
06/01/2022
Compensation
Common
03/10/2023
Long Term Incentive Program
Issuer
N
14143
03/10/2023
Compensation
Common
03/14/2023
Long Term Incentive Program
Issuer
N
3000
03/14/2023
Compensation
Common
07/27/2023
Options Granted - 06/01/2020
Issuer
N
7500
07/27/2023
Cash
Y
07/27/2023
/s/ Ryan Riviere, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Leon Topalian