<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-01-05</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001122976</issuerCik>
        <issuerName>AVIENT CORP</issuerName>
        <issuerTradingSymbol>AVNT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002106448</rptOwnerCik>
            <rptOwnerName>Rizzo Aniello</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>AVIENT CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>33587 WALKER ROAD</rptOwnerStreet2>
            <rptOwnerCity>AVON LAKE</rptOwnerCity>
            <rptOwnerState>OH</rptOwnerState>
            <rptOwnerZipCode>44012</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>SVP, Global Supply Chain</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <remarks>Exhibit 24 - Power of Attorney. This Form 3 filing is late due to a delay in receiving EDGAR filing codes for Mr. Rizzo from the SEC.</remarks>

    <ownerSignature>
        <signatureName>/s/ Robert K. James, Power of Attorney for Aniello Rizzo</signatureName>
        <signatureDate>2026-01-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
