Spike Jonze	...	(Director)
Spike Jonze	...	(Writer)
Scarlett Johansson	...	Samantha (voice)
Lynn Adrianna	...	Letter Writer #1
Amy Adams	...	Amy
Lisa Renee Pitts	...	Letter Writer #2
Olivia Wilde	...	Blind Date
Gabe Gomez	...	Letter Writer #3
Rooney Mara	...	Catherine
Chris Pratt	...	Paul
Artt Butler	...	Text Voice (voice)
Joaquin Phoenix	...	Theodore
May Lindstrom	...	Sexy Pregnant TV Star
Portia Doubleday	...	Isabella
Cassandra Starr	...	Bikini Babe
Matt Letscher	...	Charles
Bill Hader	...	Chat Room Friend #2
Kristen Wiig	...	SexyKitten
Sam Jaeger	...	Dr. Johnson
Brian Johnson	...	OS1 Commercial Lead
Katherine Boecher	...	Her
Alia Janine	...	Commuter
Laura Colquhoun	...	Maria (as Laura Lyon Rossi)
Kelly Sarah	...	Bikini Beach Babe
Laura Meadows	...	Dream Sequence
Spike Jonze	...	Alien Child (as Adam Spiegel)
Owen Pallett	...	Composer
David Azar	...	Theodore's Divorce Attorney
Hoyte Van Hoytema	...	Cinematographer
Jeff Buchanan	...	Editor
Dr. Guy Lewis	...	Marriage Counselor
Guy Lewis	...	Marriage Counselor (as Dr. Guy Lewis)
Eric Zumbrunnen	...	Editor
Melanie Seacat	...	Nice Lady
Pramod Kumar	...	Pizza Vendor
Evelyn Edwards	...	Mother Who Dated Pricks
Steve Zissis	...	New Sweet Boyfriend of Mother Who Dated Pricks
Dane White	...	Son
Nicole Grother	...	Daughter
James Ozasky	...	Catherine's Dad
Samantha Sarakanti	...	Mother of Newborn
Luka Jones	...	Lewman
Gracie Prewitt	...	Jocelyn (Birthday Girl)
Claudia Choi	...	Uncomfortable Waitress
Laura Kai Chen	...	Tatiana
Soko	...	Voice of Isabella (voice)
Wendy Leon	...	Grocery Shopper
Charles Riley	...	Busker / Dancer (as Charles 'Lil Buck' Riley)
Robert Benard	...	Michael Wadsworth (Editor)
Lisa Cohen	...	Michael Wadsworth's Wife
Grant Samson	...	Michael Wadsworth's Associate
Brian Cox	...	Alan Watts (voice)
Arcade Fire	...	Composer
K.K. Barrett	...	Production Designer
Cecilia Sweatman	...	additional second assistant director
Ray Angelic	...	unit production manager: additional photography
Gene Serdena	...	Set Decorator
Amanda Bi	...	production supervisor: Shanghai
Casey Storm	...	Custome Designer
Randall James Bol	...	post-production supervisor
Steve Artmont	...	makeup department head
Lucy Lu	...	production manager: Shanghai
Kristin Berge	...	hair department head: additional photography
Daniel Lupi	...	Unit Production Manager
Cydney Cornell	...	hair department head
James Masi	...	head of post production: Annapurna
Daniel Curet	...	assistant hair stylist
Ming Na Li	...	key hair stylist: Shanghai
Michael McDermott	...	production supervisor: Shanghai
Hameed Shaukat	...	post-production supervisor
Peng Qiu	...	hair stylist assistant: Shanghai / makeup artist assistant: Shanghai
Shan Shan Wang	...	hair stylist assistant: Shanghai / makeup artist assistant: Shanghai
Will Weiske	...	Production Supervisor
Winner Zhang	...	assistant production manager: Shanghai
Cindy J. Williams	...	assistant makeup artist (as Cindy Williams)
Bo Xian	...	key makeup artist: Shanghai
Robert E. Kay	...	second assistant director
Teresa Lee	...	third assistant director: Shanghai
Lemon Liu	...	second assistant director: Shanghai
Sylvia Liu	...	first assistant director: Shanghai
John Nasraway	...	second second assistant director: additional photograhy
Matt Pang	...	second second assistant director: Shanghai
David K. Riebel	...	second second assistant director (as David Riebel)
Joe Roddey	...	second assistant director: additional photograhy (as Joseph Roddey)
Rod Smith	...	first assistant director: additional photography (as Rodney Smith)
Thomas Patrick Smith	...	first assistant director (as Thomas P. Smith)
Eddie Acuña	...	laborer foreman (as Edmund Acuna)
Jory Alvarado	...	set dresser
Gregory Paul Austin	...	prop maker
Matthew Cavaliero	...	property master
Zhong Hao Chen	...	property master: Shanghai
Allen Coulter	...	Set Designer
Chad R. Davis	...	on set dresser/man at large
Venessa De Anda	...	art department coordinator
Jem Elsner	...	property assistant
Jane Fitts	...	graphic designer
James A. Fleming	...	set dresser (as Jamie Fleming)
Jennifer D. Fodor	...	art department production assistant (as Jennifer Fodor)
Chris Forster	...	construction coordinator
Michael Garcia	...	set dresser (as Michael S. Garcia)
Sonny Gerasimowicz	...	concept illustrator
Scott Head	...	prop maker
Douglas R. Johnson	...	painter
Michael Leblovic	...	decorator gang boss
Tian Hang Lu	...	art director: Shanghai
Florencia Martin	...	set dressing buyer
Richard Martinez	...	laborer
Rangel Mata	...	painter
Geoff McFetridge	...	graphical futurist designer
Shannon McGinnis	...	assistant property master: additional photography
Jesse Oliver	...	set dresser
Yu Bing Pan	...	set dresser: Shanghai
Jason Perrine	...	graphic designer
Bobby Pollard	...	set dresser (as Robert Pollard)
Eric Reichardt	...	paint supervisor
Kim Richey	...	assistant property master
Leanne Shapton	...	armpit sex drawing
Josh Sheppard	...	storyboard artist
Pilo Silva	...	greensman: additional photography
Daron Smith	...	construction foreman
Wei Jian Sun	...	assistant art director: Shanghai
Michael Timman	...	set dresser
Joshua Towers	...	set dresser (as Josh Towers)
John Youngblood	...	assistant property master: additional photography (as Johnny Youngblood)
Thom Brennan	...	foley editor
Tom Caton	...	sound utility: additional photography
Coya Elliott	...	first assistant sound editor
Malcolm Fife	...	dialogue editor
Xun Huang	...	sound mixer: Shanghai
David C. Hughes	...	Sound Effects Editor
Bobby Johanson	...	adr mixer
Ren Klyce	...	sound supervisor
Nick Kray	...	adr mixer
Drew Kunin	...	production sound mixer
Mary Jo Lang	...	foley mixer (as Maryjo Lang)
Bing Song Li	...	boom operator: Shanghai
Jeremy Molod	...	assistant sound editor
Alyson Dee Moore	...	foley artist (as Alyson Moore)
Chris Navarro	...	adr mixer
Thomas J. O'Connell	...	adr mixer
Song Pu	...	boom operator: Shanghai
Brian Robinson	...	Boom Operator
John Roesch	...	foley artist
Michael Semanick	...	additional mixing
Steve Slanec	...	dialogue editor
Kent Sparling	...	additional mixing
Mark Weingarten	...	sound mixer: additonal photography
Zach Wrobel	...	sound utility (as Zachary J. Wrobel)
Gwendolyn Yates Whittle	...	adr editor
Lawrence Zipf	...	sound recordist (as Larry Zipf)

Summary: A lonely writer develops an unlikely relationship with his newly purchased operating system that's designed to meet his every need.