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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2016-07-28</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001117106</issuerCik>
        <issuerName>NETSUITE INC</issuerName>
        <issuerTradingSymbol>N</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001341439</rptOwnerCik>
            <rptOwnerName>ORACLE CORP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>500 ORACLE PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>REDWOOD CITY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94065</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001685623</rptOwnerCik>
            <rptOwnerName>OC Acquisition LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>500 ORACLE PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>REDWOOD CITY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94065</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001685624</rptOwnerCik>
            <rptOwnerName>Napa Acquisition Corp</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>500 ORACLE PARKWAY</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>REDWOOD CITY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94065</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>No securities are beneficially owned</value>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Each of the Reporting Persons may be deemed to have become a 10% Owner of the Issuer in connection with the entry into of certain Tender and Support Agreements dated July 28, 2016 (the &quot;Tender Agreements&quot;), by OC Acquisition LLC and Napa Acquisition Corporation, and each of Zachary Nelson, Evan Goldberg, James McGeever, Ronald Gill and NetSuite Restricted Holdings LLC, an entity controlled by Lawrence J. Ellison (each, a &quot;Stockholder&quot;), representing an aggregate of 35,291,317 shares of Issuer common stock beneficially owned by the Stockholders.  The Tender Agreements were entered into in connection with the Agreement and Plan of Merger, dated July 28, 2016, by and among the Reporting Persons and Issuer.  The Reporting Persons exercise voting power in limited situations over such shares of the Issuer's common stock through the grant of an irrevocable proxy by each of the Stockholders in the Tender Agreements.</footnote>
        <footnote id="F2">(continued from Footnote 1) The Reporting Persons have no pecuniary interest in any of such shares of Issuer's common stock.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/Brian S. Higgins, Vice President, Oracle Corporation</signatureName>
        <signatureDate>2016-09-27</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/Brian S. Higgins, Secretary, OC Acquisition LLC</signatureName>
        <signatureDate>2016-09-27</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/Brian S. Higgins, Vice President, Napa Acquisition Corporation</signatureName>
        <signatureDate>2016-09-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
