<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001699662</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001097864</issuerCik>
            <issuerName>ON SEMICONDUCTOR CORPORATION</issuerName>
            <secFileNumber>001-39317</secFileNumber>
            <issuerAddress>
                <ns2:street1>5701 N. Pima Road</ns2:street1>
                <ns2:city>Scottsdale</ns2:city>
                <ns2:stateOrCountry>AZ</ns2:stateOrCountry>
                <ns2:zipCode>85250</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(602) 244-6600</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>BERNARD COLPITTS</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>38th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>2795</noOfUnitsSold>
            <aggregateMarketValue>277208.10</aggregateMarketValue>
            <noOfUnitsOutstanding>431528954</noOfUnitsOutstanding>
            <approxSaleDate>09/11/2023</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <acquiredDate>02/10/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>801</amountOfSecuritiesAcquired>
            <paymentDate>02/10/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <acquiredDate>02/07/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Performance Shares</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1994</amountOfSecuritiesAcquired>
            <paymentDate>02/07/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>09/11/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>06/12/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Bernard Raymond Colpitts</signature>
        </noticeSignature>
    </formData>
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144
0001699662
XXXXXXXX
LIVE
0001097864
ON SEMICONDUCTOR CORPORATION
001-39317
5701 N. Pima Road
Scottsdale
AZ
85250
(602) 244-6600
BERNARD COLPITTS
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Floor
New York
NY
10004
2795
277208.10
431528954
09/11/2023
NASDAQ
COMMON
02/10/2023
Restricted Stock
ISSUER
N
801
02/10/2023
Not Applicable
COMMON
02/07/2023
Performance Shares
ISSUER
N
1994
02/07/2023
Not Applicable
Y
09/11/2023
06/12/2023
/s/ Bernard Raymond Colpitts