Robin Williams as Hunter 'Patch' Adams

Monica Potter as Carin Fisher

Philip Seymour Hoffman as Mitch Roman

Daniel London as Truman Schiff

Bob Gunton as Dean Walcott

Harve Presnell as Dean Anderson

Peter Coyote as Bill Davis

Michael Jeter as Rudy

Josef Sommer as Dr. Eaton

Irma P. Hall as Joletta

Barry Shabaka Henley as Emmet

Frances Lee McCain as Judy

Daniella Kuhn as Adelane

James Greene as Bile

Harold Gould as Arthur Mendelson

Bruce Bohne as Trevor Beene

Harry Groener as Dr. Prack

Steven Anthony Jones as Charlie

Richard Kiley as Dr. Titan

Douglas Roberts as Larry

Ellen Albertini Dow as Aggie

Alan Tudyk as Everton

Ryan Hurst as Neil

Peter Siteri as Chess Man

Don West as Instructor

Greg Sestero as Jaime

Jason Aaron Baca as Patch Pirate

Ismael 'East' Carlo as Hispanic Father

Diane Amos as Older Waitress

Andy Arness as Orderly (uncredited)

Renee Rogers as Receptionist

Dot-Marie Jones as Miss Meat

Ralph Peduto as Organizer

Norman Alden as Truck Driver

Sonya Eddy as Older Waitress