Steve Carell as John du Pont

Channing Tatum as Mark Schultz

Mark Ruffalo as David Schultz

Sienna Miller as Nancy Schultz

Vanessa Redgrave as Jean du Pont

Anthony Michael Hall as Jack

Guy Boyd as Henry Beck

Brett Rice as Fred Cole

Jackson Frazer as Alexander Schultz

Samara Lee as Danielle Schultz

Francis J. Murphy III as Wayne Kendall

Jane Mowder as Rosie

David Bennett as Documentary Director

Lee Perkins as Corporal

Robert Haramia as Banquet Guest

Daniel Hilt as Roberto Garcia

Bryan Cook as Ben Langer

David Zabriskie as Dan Bane

Zach Rey as Foxcatcher Wrestler #1

Reece Humphrey as Foxcatcher Wrestler #2

J.D. Bergman as Foxcatcher Wrestler #3

Corey Jantzen as Foxcatcher Wrestler #4

Frederick Feeney as Seoul Referee

Mark Schultz as Weigh-in Official #1

Lee Kemp as Weigh-in Official #2

Jake Herbert as Mark's Opponent at Trials

Donald Modrick as Front Gate Guard

Gabrielle Burton as School Secretary

Kevin Cooke as Photographer

Richard E. Chapla Jr. as Broiler Hut Cashier

Bill Ehrin as Broiler Hut Patron

Roger Callard as Helicopter Pilot

Dan Anders as General

Barry Vlanich as D.C. Partygoer

Sam Brehm as Hank Church

Stan Dziedzic as USA Wrestling Rep #1

David Miller as USA Wrestling Rep #2

Brian Baumgartner as USA Wrestling Rep #3

Joe Russo as Olympic Trials Referee

Ken Williams as Coach Ken

Gene Mills as Worlds Referee

John C. Baxter as Worlds Announcer

Rick Steigerwald as Wexler Trainer

Marc Snider as MMA Referee

Jaz Securo as MMA Announcer

Corey Walker as MMA Backstage Official

Alan Oppenheimer as Du Pont Dynasty Narrator (voice)

Joe Fishel as Trainer

Jackson Nunn as Spectator (uncredited)

Lou Consolo as Fight Manager (uncredited)