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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2019-02-21</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000055067</issuerCik>
        <issuerName>KELLOGG CO</issuerName>
        <issuerTradingSymbol>K</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001767816</rptOwnerCik>
            <rptOwnerName>MURGUIA RAMON</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>ONE MICHIGAN AVE. EAST</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BATTLE CREEK</rptOwnerCity>
            <rptOwnerState>MI</rptOwnerState>
            <rptOwnerZipCode>49017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>300</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On February 21, 2019, the reporting person became a co-trustee of the W.K. Kellogg Foundation Trust, which currently holds approximately 18.8% of the outstanding shares of Kellogg Company common stock (&quot;Shares&quot;).  The reporting person is neither a direct nor an indirect beneficial owner, as defined in Rule 16a-1(a)(2), of any Shares held by the Trust.  The Shares reported on this Form 3 are held directly by the reporting person and with respect to which the reporting person is the direct beneficial owner.</footnote>
    </footnotes>

    <remarks>Exhibit List: Exhibit 24.1 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Michael A. Weiland, Attorney-in-Fact</signatureName>
        <signatureDate>2019-02-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
