 | Affections (2016) |
 | The Little Prince (2015) as The King (voice) |
 | The Source Family (2013) as Self (archive footage) |
 | The Number 23 (2007) as Dr. Sirius Leary |
 | This Is an Adventure (2005) as Self |
 | Matthew Gray Gubler's Life Aquatic Intern Journal (2005) as Self |
 | The Life Aquatic with Steve Zissou (2004) as Bill Ubell |
 | The Big Empty (2003) as Neely |
 | Raw Iron: The Making of 'Pumping Iron' (2002) as Self (archive footage) |
 | Pollock (2000) as Howard Putzel |
 | Coyote Ugly (2000) as Romero |
 | But I'm a Cheerleader (2000) as Peter |
 | The Million Dollar Hotel (2000) as Shorty |
 | South of Heaven, West of Hell (2000) as Agent Otts |
 | Altman on His Own Terms (2000) as Self |
 | Dogma (1999) as John Doe Jersey |
 | I Woke Up Early the Day I Died (1998) as Shopkeeper |
 | Sweet Jane (1998) as Dr. Geiler |
 | Jitters (1997) as Michael |
 | Heat (1995) as Solenko, Restaurant Manager (uncredited) |
 | Theodore Rex (1995) as Spinner |
 | Girl in the Cadillac (1995) as Bud |
 | Crazy for a Kiss (1995) as Dr. Webb |
 | And the Band Played On (1993) as Antique Shop Owner |
 | Carol Leifer: Gaudy, Bawdy & Blue (1992) as Squid Jr. |
 | Ted & Venus (1991) as Ted Whitley |
 | Brain Dead (1990) as Jack Halsey |
 | The Chocolate War (1988) as Brother Jacques |
 | Out of the Dark (1988) as Dave Stringer |
| | Out of the Dark (1988) as Stringer |
 | Martini Ranch: Reach (1988) as Crazy Local |
 | Love at Stake (1987) as Parson Babcock |
 | Bates Motel (1987) as Alex West |
 | Invaders from Mars (1986) as Mark Weinstein |
 | Telephone (1986) |
 | Electric Dreams (1984) as Edgar (voice) |
 | Maria's Lovers (1984) as Harvey |
 | The Secret Diary of Sigmund Freud (1984) as Sigmund Freud |
 | The Nightingale (1983) as Music Master |
 | Love Letters (1983) as Danny De Fronso |
 | Hysterical (1982) as Dr. John |
 | Rumpelstiltskin (1982) as The Page |
 | Night of 100 Stars (1982) as Self |
 | She Dances Alone (1981) as Director |
 | Die Laughing (1980) as Mueller |
 | Brave New World (1980) as Bernard Marx |
 | Son of Hitler (1979) as Willi Hitler |
 | Why Shoot the Teacher? (1977) as Max Brown |
 | Pumping Iron (1977) as Self |
 | Bernice Bobs Her Hair (1976) as Warren |
 | Roma drogata - La polizia non può intervenire (1975) as Massimo Monaldi |
 | Harold and Maude (1971) as Harold |
 | Brewster McCloud (1971) as Brewster |
 | The Traveling Executioner (1970) as Jimmy Croft |
 | Gas! -Or- It Became Necessary to Destroy the World in Order to Save It. (1970) as Hooper |
 | The Strawberry Statement (1970) as Elliot |
 | M*A*S*H (1970) as Pvt. Warren Boone |
 | Sweet Charity (1969) as Flower Child (uncredited) |
 | Up the Down Staircase (1967) as Student |
| | Ted & Venus Director |
| | Ted & Venus Screenplay |
| | Martini Ranch: Reach Recording Supervision |
| | She Dances Alone Dramaturgy |
