<SEC-DOCUMENT>0001645113-19-000011.txt : 20191122
<SEC-HEADER>0001645113-19-000011.hdr.sgml : 20191122
<ACCEPTANCE-DATETIME>20191122162240
ACCESSION NUMBER:		0001645113-19-000011
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20191120
FILED AS OF DATE:		20191122
DATE AS OF CHANGE:		20191122

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DOYLE WILLIAM F
		CENTRAL INDEX KEY:			0001194459

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37565
		FILM NUMBER:		191241909

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NovoCure Ltd
		CENTRAL INDEX KEY:			0001645113
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				000000000
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		NO. 4 THE FORUM
		STREET 2:		GRENVILLE STREET
		CITY:			ST. HELIER
		STATE:			Y9
		ZIP:			JE2 4UF
		BUSINESS PHONE:		44 (0)15 3475 6700

	MAIL ADDRESS:	
		STREET 1:		NO. 4 THE FORUM
		STREET 2:		GRENVILLE STREET
		CITY:			ST. HELIER
		STATE:			Y9
		ZIP:			JE2 4UF

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Novocure Ltd
		DATE OF NAME CHANGE:	20150615
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_157445774481944.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2019-11-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001645113</issuerCik>
        <issuerName>NovoCure Ltd</issuerName>
        <issuerTradingSymbol>NVCR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001194459</rptOwnerCik>
            <rptOwnerName>DOYLE WILLIAM F</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O NOVOCURE INC.,</rptOwnerStreet1>
            <rptOwnerStreet2>20 VALLEY STREAM PARKWAY, SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>MALVERN</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19355</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Executive Chairman</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2019-11-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>149300</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>90.3551</value>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>660165</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2019-11-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>700</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>91.01</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>659465</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">On November 20, 2019, pursuant to a Rule 10b5-1 trading plan adopted by Mr. Doyle, Mr. Doyle sold 149,300 shares in multiple trades at prices ranging from $90.00 to $91.00.  The price reported above reflects the weighted average sale price.  Mr. Doyle hereby undertakes to provide to the Staff, the issuer or any security holder of the issuer upon request, full information regarding the number of shares and prices at which the transaction was effected.</footnote>
        <footnote id="F2">Transaction was made pursuant to a Rule 10b5-1 trading plan adopted by Mr. Doyle.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>By: /s/ Kimberly Burke, Attorney in fact for William F. Doyle</signatureName>
        <signatureDate>2019-11-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
