| Liza: A Truly Terrific Absolutely True Story (2024) Self |
| Being Mary Tyler Moore (2023) Self (voice) |
| tick, tick... BOOM! (2021) "Sunday" Legend #4 |
| On Broadway (2019) Self (archive footage) |
| Fiddler: A Miracle of Miracles (2019) Himself |
| It Takes a Lunatic (2019) Self |
| Private Screenings: Robert Osborne (2014) Self |
| Cabaret: The Musical That Changed Musicals (2013) Self |
| Broadway Musicals: A Jewish Legacy (2013) Narrator |
| Hollywood Singing and Dancing: A Musical History (2008) Self |
| Choke (2008) Phil |
| Hollywood Singing and Dancing: A Musical History - The 1920s: The Dawn of the Hollywood Musical (2008) Self |
| Drama, Tanz und Beine (2007) Narrator |
| Broadway's Lost Treasures (2003) Host (segment "Leading Men") / Emcee (segment "Cabaret") |
| 111 Gramercy Park (2003) Hornsby |
| The Making and Meaning of 'We Are Family' (2002) Self |
| On the Edge (2001) Dr. Mensley (segment "Reaching Normal") |
| The Fantasticks (2000) Amos Bellamy |
| Dancer in the Dark (2000) Oldrich Novy |
| A Christmas Carol (1999) The Ghost of Christmas Past |
| The Music of Kander & Ebb: Razzle Dazzle (1997) Self |
| My Friend Joe (1996) Simon |
| The empty mirror (1996) |
| Venus Rising (1995) Jimmie |
| The Wizard of Oz in Concert: Dreams Come True (1995) Professor Marvel / The Gatekeeper / The Carriage Driver / The Palace Guard / The Wizard of Oz |
| The Dangerous (1995) Flea |
| The Music of Chance (1993) Willy Stone |
| The Player (1992) Joel Grey |
| Robert Altman's Players (1992) Self |
| Kafka (1991) Burgel |
| Marilyn and Me (1991) Johnny Hyde |
| Night of 100 Stars III (1990) Self |
| Cabaret (1988) The Emcee |
| Witnesses to the Holocaust: The Trial of Adolf Eichmann (1987) Narrator |
| Remo Williams: The Adventure Begins (1985) Chiun |
| The Yeomen of the Guard (1982) Jack Point |
| Night of 100 Stars (1982) Self |
| Charlie Chaplin: The Little Tramp (1980) Self - Host |
| The Seven-Per-Cent Solution (1976) Lowenstein |
| Buffalo Bill and the Indians, or Sitting Bull's History Lesson (1976) The Producer (Nate Salisbury) |
| 'Twas the Night Before Christmas (1974) Joshua Trundle (voice) |
| Man on a Swing (1974) Franklin Wills |
| Don't Call Me Mama Anymore (1973) |
| Man On A String (1972) Big Joe Brown |
| Cabaret (1972) Master of Ceremonies |
| The Recreation of an Era (1972) |
| George M! (1970) George M. Cohan |
| What a Way to Go! (1964) Patron (uncredited) |
| Come September (1961) Beagle |
| Calypso Heat Wave (1957) |
| About Face (1952) Bender |