<?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>0001763605</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>SIMON KEETON</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>E*TRADE FINANCIAL CORPORATION</name>
                <address>
                    <ns2:street1>3 EDISON DRIVE</ns2:street1>
                    <ns2:city>ALPHARETTA</ns2:city>
                    <ns2:stateOrCountry>GA</ns2:stateOrCountry>
                    <ns2:zipCode>30005</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>10276</noOfUnitsSold>
            <aggregateMarketValue>1027640.08</aggregateMarketValue>
            <noOfUnitsOutstanding>431872829</noOfUnitsOutstanding>
            <approxSaleDate>07/13/2023</approxSaleDate>
            <securitiesExchangeName>NASD</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <acquiredDate>03/04/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>4054</amountOfSecuritiesAcquired>
            <paymentDate>03/04/2021</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <acquiredDate>01/07/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3154</amountOfSecuritiesAcquired>
            <paymentDate>01/07/2022</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <acquiredDate>01/07/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3068</amountOfSecuritiesAcquired>
            <paymentDate>01/07/2021</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>SIMON KEETON</name>
                <address>
                    <ns2:street1>5701 N. Pima Road</ns2:street1>
                    <ns2:city>Scottsdale</ns2:city>
                    <ns2:stateOrCountry>AZ</ns2:stateOrCountry>
                    <ns2:zipCode>85250</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/30/2023</saleDate>
            <amountOfSecuritiesSold>11310</amountOfSecuritiesSold>
            <grossProceeds>1074450.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>07/13/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>02/17/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Simon Keeton</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
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144
0001763605
XXXXXXXX
LIVE
0001097864
ON SEMICONDUCTOR CORPORATION
001-39317
5701 N. Pima Road
Scottsdale
AZ
85250
(602) 244-6600
SIMON KEETON
Officer
Common
E*TRADE FINANCIAL CORPORATION
3 EDISON DRIVE
ALPHARETTA
GA
30005
10276
1027640.08
431872829
07/13/2023
NASD
COMMON
03/04/2021
Restricted Stock
ISSUER
N
4054
03/04/2021
Not Applicable
COMMON
01/07/2022
Restricted Stock
ISSUER
N
3154
01/07/2022
Not Applicable
COMMON
01/07/2021
Restricted Stock
ISSUER
N
3068
01/07/2021
Not Applicable
N
SIMON KEETON
5701 N. Pima Road
Scottsdale
AZ
85250
Common
06/30/2023
11310
1074450.00
07/13/2023
02/17/2023
/s/ Simon Keeton