Robin Williams
Hunter 'Patch' Adams

Monica Potter
Carin Fisher

Philip Seymour Hoffman
Mitch Roman

Daniel London
Truman Schiff

Bob Gunton
Dean Walcott

Harve Presnell
Dean Anderson

Peter Coyote
Bill Davis

Michael Jeter
Rudy

Josef Sommer
Dr. Eaton

Irma P. Hall
Joletta

Barry Shabaka Henley
Emmet

Frances Lee McCain
Judy

Daniella Kuhn
Adelane

James Greene
Bile

Harold Gould
Arthur Mendelson

Bruce Bohne
Trevor Beene

Harry Groener
Dr. Prack

Richard Kiley
Dr. Titan

Douglas Roberts
Larry

Ellen Albertini Dow
Aggie

Alan Tudyk
Everton

Ryan Hurst
Neil

Don West
Instructor

Greg Sestero
Jaime

Ismael 'East' Carlo
Hispanic Father

Andy Arness
Orderly (uncredited)

Dot-Marie Jones
Miss Meat

Ralph Peduto
Organizer

Norman Alden
Truck Driver

Sonya Eddy
Older Waitress

James Anthony Cotton
Psych Patient

Michael X. Sommers
Psych Patient

David Fine
Psych Patient

James Carraway
Psych Patient

Lorri Holt
Pediatric Nurse

Vivis Colombetti
Hysterical Woman (as Vivis)

Donna Kimball
Waitress

Kelvin Han Yee
Orderly (as Kelvin Yee)

Bill Roberson
Fred Jarvis

Randy Oglesby
Pinstriped Man

Bonnie Johnson
Walcott's Secretary

Karen Pavlick
Mrs. Davis (as Karen Michel)

James Allen
Ed

Michael Stanton Kennedy
Gynecologist (as Michael Kennedy)