George Clooney character Michael Clayton
Tom Wilkinson character Arthur Edens
Michael O'Keefe character Barry Grissom
Sydney Pollack character Marty Bach
Danielle Skraastad character Bridget Klein (voice)
Tilda Swinton character Karen Crowder
Wai Chan character Chinese Dealer
Alberto Vazquez character Player #1
Brian Koppelman character Player #2
Tom McCarthy character Waiter (voice)
Denis O'Hare character Mr. Greer
Julie White character Mrs. Greer
Austin Williams character Henry Clayton
Jennifer Van Dyck character Ivy
Frank Wood character Gerald
Richard Hecht character Auctioneer
Bill Raymond character Gabe Zabel
Jonathan Walker character Del (voice)
Sharon Washington character Pam
Cynthia Mace character Wendy (voice)
Michael Countryman character Evan (voice)
Ken Howard character Don Jeffries
Amy Hargreaves character Interviewer
Susan Pellegrino character Secretary
Rachel Black character Maude
Matthew Detmer character Todd
John Douglas Thompson character Jail Guard
Merritt Wever character Anna
Brian Poteat character Deposition Lawyer
Christopher Mann character Lieutenant Elston
Edward Furs character Milwaukee Captain
Katherine Waterston character Third Year
John Gerard Franklin character Correction Officer
Remy Auberjonois character Fifth Year
Pun Bandhu character Fourth Year
Jason Strong character First Year
Robert Prescott character Mr. Verne
Paul Oquist character Starter
Terry Serpico character Mr. Iker
Heidi Armbruster character Anna's Sister
Pamela Gray character Cindy Bach
Andrew Hunter Sherman character U / North (voice)
Kevin Hagan character Raymond Clayton
Julia Gibson character Stephanie Clayton
Sean Cullen character Gene Clayton
Susan Egbert character Michelle
David Lansbury character Timmy Clayton
David Zayas character Detective Dalberto
Douglas McGrath character Jeff Gaffney
Gregory Dann character Cop
Cathy Diane Tomlin character Cop #2
Sam Gilroy character Copy Kid
Maggie Siff character Attorney #1
Sarah Nichols character Barry's Assistant
Susan McBrien character Jean
Jordan Lage character Partner
Neal Huff character First Associate
Paul Juhn character Second Associate
Patrick Askin character Auction Bidder (uncredited)
Angelo Bonsignore character Videographer (uncredited)
Kevin Cannon character Auction Worker (uncredited)
Clem Cheung character Landlord (uncredited)
Tony Gilroy character Taxi Driver (voice) (uncredited)
Emelie Jeffries character Raymond Clayton's Nurse (uncredited)
Josh Mowery character Lawyer (uncredited)
Kimmy Suzuki character Copy Shop Clerk (uncredited)
Steven Weisz character Executive (uncredited)
