Actor
- The Private Lives of Pippa Lee (2009) .... Herb Lee
- City Island (2009) ....
- Sunshine Cleaning (2009) .... Joe Lorkowski
- 81st Annual Academy Awards (2009) .... Himself - Presenter: Best Supporting Actor
- Marley & Me (2008) .... Arnie Klein
- Not Quite Hollywood: The Wild, Untold Story of Ozploitation! (2008) .... Himself (archive footage)
- Get Smart (2008) .... The Chief
- Oscar, que empiece el espectáculo (2008) .... Grandpa Edwin Hoover (archive footage) (uncredited)
- Rendition (2007) .... Senator Hawkins
- The Santa Clause 3: The Escape Clause (2006) .... Bud Newman
- Little Miss Sunshine (2006) .... Grandpa Edwin Hoover
- Firewall (2006) .... Arlin Forester
- Raising Flagg (2006) .... Flagg Purdy
- The Novice (2006) .... Father Benkhe
- Will & Grace It's a Dad, Dad, Dad, Dad World (2005) .... Marty Adler
- Eros (2004) .... Dr. Pearl / Hal (segment "Equilibrium")
- Noel (2004) .... Artie Venzuela
- And Starring Pancho Villa as Himself (2003) .... Sam Drebben
- The Pentagon Papers (2003) .... Harry Rowen
- Thirteen Conversations About One Thing (2002) .... Gene
- America's Sweethearts (2001) .... Wellness Guide
- Varian's War (2001) .... Freier
- 100 Centre Street (2001) .... Joe Rifkind (10 episodes, 2001-2002)
- Second to None (2001) .... Himself (archive footage)
- Arigo (2000) ....
- Magicians (2000) .... Milo
- Jakob the Liar (1999) .... Frankfurter
- Blood Money (1999) .... Willy 'the Hammer' Canzaro
- Slums of Beverly Hills (1998) .... Murray Samuel Abromowitz
- Comic Relief VIII (1998) .... Himself
- O Que É Isso, Companheiro? (Four Days in September) (1998) .... Charles Burke Elbrick
- Gattaca (1997) .... Det. Hugo
- Grosse Pointe Blank (1997) .... Dr. Oatman
- Mother Night (1996) .... George Kraft
- Heck's Way Home (1996) .... Dogcatcher
- Steal Big Steal Little (1995) .... Lou Perilli, Ruben's Partner
- The Jerky Boys (1995) .... Ernie Lazarro
- Picture Windows (1994) .... Tully (2 episodes, 1995)
- Doomsday Gun (1994) .... Col. Yossi
- North (1994) .... Judge Buckle
- So I Married an Axe Murderer (1993) .... Police Captain (uncredited)
- Taking the Heat (1993) .... Tommy Canard
- Indian Summer (1993) .... Unca Lou Handler
- Cooperstown (1993) .... Harry Willette
- Samuel Beckett Is Coming Soon (1993) .... The Director
- Glengarry Glen Ross (1992) .... George Aaronow
- The Rocketeer (1991) .... A. 'Peevy' Peabody
- Edward Scissorhands (1990) .... Bill
- Havana (1990) .... Joe Volpi
- Coupe de Ville (1990) .... Fred Libner
- In the Director's Chair: The Man Who Invented Edward Scissorhands (1990) .... Himself
- Necessary Parties (1988) .... Archie Corelli
- Escape from Sobibor (1987) .... Leon Feldhendler
- Big Trouble (1986) .... Leonard Hoffman
- A Deadly Business (1986) .... Harold Kaufman
- Bad Medicine (1985) .... Dr. Ramón Madera
- Joshua Then and Now (1985) .... Reuben Shapiro
- The Second City 25th Anniversary Special (1985) .... Himself
- The Fourth Wise Man (1985) .... Orontes
- A Matter of Principle (1984) .... Flagg Purdy
- Terror in the Aisles (1984) .... Harry Roat Jr - Wait Until Dark (archive footage)
- The Return of Captain Invincible (1984) .... Captain Invincible
- The Last Unicorn (1982) .... Schmendrick (voice)
- Chu Chu and the Philly Flash (1981) .... Flash
- Improper Channels (1981) .... Jeffrey Martley
- Full Moon High (1981) .... Dr. Brand
- The Magician of Lublin (1980) .... Yasha Mazur
- Simon (1980) .... Prof. Simon Mendelssohn
- The In-Laws (1979) .... Sheldon S. Kornpett, D.D.S.
- Carol Burnett & Company (1979) .... (1 episode, 1979)
- The Defection of Simas Kudirka (1978) .... Simas Kudirka
- The Other Side of Hell (1978) .... Frank Dole
- Fire Sale (1978) .... Ezra Fikus
- America at the Movies (1977) .... Capt. John Yossarian (archive footage)
- The Seven-Per-Cent Solution (1977) .... Dr. Sigmund Freud
- Hearts of the West (1975) .... Kessler
- Rafferty and the Gold Dust Twins (1975) .... Gunny Rafferty
- Freebie and the Bean (1974) .... Bean
- It Couldn't Happen to a Nicer Guy (1974) ....
- Last of the Red Hot Lovers (1973) .... Barney Cashman
- Deadhead Miles (1972) .... Cooper
- Little Murders (1971) .... Lt. Practice
- Catch-22 (1970) .... Capt. John Yossarian
- Popi (1969) .... Abraham
- The Monitors (1969) .... Cameo appearance
- The Heart Is a Lonely Hunter (1968) .... John Singer
- Inspector Clouseau (1968) .... Insp. Jacques Clouseau
- Wait Until Dark (1967) .... Harry Roat
- Woman Times Seven (1967) .... Fred (segment "The Suicides")
- The Last Mohican (1966) .... Pretzel Peddler
- The Russians Are Coming the Russians Are Coming (1966) .... Lt. Rozanov
- The 19th Annual Tony Awards (1965) .... Himself - Presenter
- That's Me (1963) ....
- Calypso Heat Wave (1957) .... Tarriers Lead Singer
- Blood (Thinner Than Water) (2004) ....
- Arigo (2000) ....
- Samuel Beckett Is Coming Soon (1993) ....
- Trying Times (1987) .... (2 episodes, 1987-1989)
- Fire Sale (1978) ....
- Fay (1975) .... (unknown episodes)
- Twigs (1975) ....
- Little Murders (1971) ....
- People Soup (1969) ....
- Samuel Beckett Is Coming Soon (1993) .... producer
- The In-Laws (1979) .... executive producer
- Blood (Thinner Than Water) (2004) .... writer
- Arigo (2000) .... writer
- Necessary Parties (1988) .... writer
- People Soup (1969) .... writer
- The Last Mohican (1966) .... writer

