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 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 Andy Arness Orderly (uncredited)