    <SEC-DOCUMENT>0001097149-19-000012-index.html : 20190404
    <SEC-HEADER>0001097149-19-000012.hdr.sgml : 20190404
    <ACCEPTANCE-DATETIME>20190404161917
    ACCESSION NUMBER:		0001097149-19-000012
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		15
    CONFORMED PERIOD OF REPORT:	20181231
    FILED AS OF DATE:		20190404
    DATE AS OF CHANGE:		20190404
    EFFECTIVENESS DATE:		20190404

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			ALIGN TECHNOLOGY INC
    		CENTRAL INDEX KEY:			0001097149
    		STANDARD INDUSTRIAL CLASSIFICATION:	ORTHOPEDIC, PROSTHETIC & SURGICAL APPLIANCES & SUPPLIES [3842]
    		IRS NUMBER:				943267295
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-32259
    		FILM NUMBER:		19732480

    	BUSINESS ADDRESS:
    		STREET 1:		2820 ORCHARD PARKWAY
    		CITY:			SAN JOSE
    		STATE:			CA
    		ZIP:			95134
    		BUSINESS PHONE:		408-470-1000

    	MAIL ADDRESS:
    		STREET 1:		2820 ORCHARD PARKWAY
    		CITY:			SAN JOSE
    		STATE:			CA
    		ZIP:			95134
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>algn-20181231xdef.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: algn-20181231xdef.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>aligntechnologyproxycard001.jpg
    <TEXT>
    Document 2 - file: aligntechnologyproxycard001.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>aligntechnologyproxycard003.jpg
    <TEXT>
    Document 3 - file: aligntechnologyproxycard003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>ceoandneototalcompcharta01.jpg
    <TEXT>
    Document 4 - file: ceoandneototalcompcharta01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>ceoawardpayout.jpg
    <TEXT>
    Document 5 - file: ceoawardpayout.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>ceocirclecharta07.jpg
    <TEXT>
    Document 6 - file: ceocirclecharta07.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>chart3a03.jpg
    <TEXT>
    Document 7 - file: chart3a03.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>growtharrowsa10.jpg
    <TEXT>
    Document 8 - file: growtharrowsa10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>logoa04.jpg
    <TEXT>
    Document 9 - file: logoa04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>payelementsinsummarya09.jpg
    <TEXT>
    Document 10 - file: payelementsinsummarya09.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>rogerselectronicsignaturea02.jpg
    <TEXT>
    Document 11 - file: rogerselectronicsignaturea02.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>sayonpaysummarya07.jpg
    <TEXT>
    Document 12 - file: sayonpaysummarya07.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>suminvisalignshipmenta01.jpg
    <TEXT>
    Document 13 - file: suminvisalignshipmenta01.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>summarytotalrevenuea01.jpg
    <TEXT>
    Document 14 - file: summarytotalrevenuea01.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>tsrforjoespecialgranta02.jpg
    <TEXT>
    Document 15 - file: tsrforjoespecialgranta02.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>