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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2015-09-29</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000010456</issuerCik>
        <issuerName>BAXTER INTERNATIONAL INC</issuerName>
        <issuerTradingSymbol>BAX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001040273</rptOwnerCik>
            <rptOwnerName>Third Point LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>390 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001300345</rptOwnerCik>
            <rptOwnerName>Loeb Daniel S</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>390 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock, $1 par value</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>53850000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Short Put Option (obligation to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>37.50</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2015-11-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>4500000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The securities disclosed in this Form 3 are owned by certain funds (the &quot;Funds&quot;) managed by Third Point LLC (&quot;Third Point&quot;). Daniel S. Loeb is the Chief Executive Officer of Third Point. By reason of the provisions of Rule 16a-1 under the Securities Exchange Act of 1934, as amended, Third Point and Mr. Loeb may be deemed to be the beneficial owners of the securities beneficially owned by the Funds. Third Point and Mr. Loeb hereby disclaim beneficial ownership of all securities, except to the extent of any indirect pecuniary interest therein.</footnote>
        <footnote id="F2">Exercisable at any time up to and including the expiration date.</footnote>
    </footnotes>

    <remarks>For purposes of Section 16 of the Securities Exchange Act of 1934, the Reporting Persons may be deemed a director by virtue of the right to nominate  a representative to serve on the Issuer's board of directors.  List of Exhibits: Exhibit 99.1 - Joint Filer Information Exhibit 99.2 - Power of Attorney, granted by Daniel S. Loeb in favor of James P. Gallagher, William Song, and Joshua L. Targoff, dated February 9, 2011, that was previously filed with the SEC on February 11, 2011, as Exhibit 99.2 to the Schedule 13G filed by Third Point LLC and Daniel S. Loeb with respect to Citadel Broadcasting Corporation and is reproduced in its entirety herein.</remarks>

    <ownerSignature>
        <signatureName>/s/ William Song, as Attorney-in-Fact for Daniel S. Loeb, Chief Executive Officer of Third Point LLC</signatureName>
        <signatureDate>2015-10-01</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ William Song, as Attorney-in-Fact for Daniel S. Loeb</signatureName>
        <signatureDate>2015-10-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
