Alan Alda
- Just a Man: Sam the Hotel
2025 Himself
- The Four Seasons
2025 Producer
- Ray Donovan: The Movie
2022 Dr. Arthur Amiot
- Marriage Story
2019 Bert Spitz
- The Emperor's Newest Clothes
2018 Narrator (voice)
- The Good Fight
2017 Solomon Waltzer
- Horace and Pete
2016 Uncle Pete
- Bridge of Spies
2015 Thomas Watters Jr.
- The Longest Ride
2015 Ira Levinson
- Broad City
2014 Dr. Jay Heller
- 50 Children: The Rescue Mission of Mr. and Mrs. Kraus
2013 Narrator (voice)
- The Blacklist
2013 Fitch
- Wanderlust
2012 Carvin
- Tower Heist
2011 Arthur Shaw
- The Human Spark
2010 Host
- Diminished Capacity
2008 Uncle Rollie
- Nothing but the Truth
2008 Albert Burnside
- Flash of Genius
2008 Gregory Lawson
- Resurrecting the Champ
2007 Ralph Metz
- 30 Rock
2006 Milton Greene
- Rachael Ray
2006
- The Aviator
2004 Senator Ralph Owen Brewster
- M*A*S*H: 30th Anniversary Reunion
2002 Himself
- Club Land
2001 Willie Walters
- The Killing Yard
2001 Ernie Goodman
- What Women Want
2000 Dan Wanamaker
- Keepers of the Frame
1999 Himself
- The West Wing
1999 Arnold Vinick
- The Object of My Affection
1998 Sidney Miller
- Murder at 1600
1997 Jordan
- Mad City
1997 Kevin Hollander
- Flirting with Disaster
1996 Richard Schlichting
- Everyone Says I Love You
1996 Bob Dandridge
- Jake's Women
1996 Jake
- Canadian Bacon
1995 U.S. President
- White Mile
1994 Dan Cutler
- ER
1994 Gabriel Lawrence
- Manhattan Murder Mystery
1993 Ted
- And the Band Played On
1993 Dr. Robert Gallo
- Whispers in the Dark
1992 Leo Green
- Betsy's Wedding
1990 Director
- Scientific American Frontiers
1990 Presenter
- Crimes and Misdemeanors
1989 Lester
- A New Life
1988 Director
- Sweet Liberty
1986 Director
- The Ratings Game
1984 Alan Alda (uncredited)
- The Four Seasons
1984 Writer
- The Four Seasons
1981 Director
- The Seduction of Joe Tynan
1979 Writer
- California Suite
1978 Bill Warren
- Same Time, Next Year
1978 George Peters
- Kill Me If You Can
1977 Caryl W. Chessman
- We'll Get By
1975 Creator
- 6 RMS RIV VU
1974 Director
- Juke and Opal
1973 Jimmy
- Isn't It Shocking?
1973 Dan
- Lily
1973
- To Kill a Clown
1972 Maj. Evelyn Ritchie
- Playmates
1972 Marshall Barnett
- The Glass House
1972 Jonathon Paige
- M*A*S*H
1972 Director
- The Mephisto Waltz
1971 Myles Clarkson
- Jenny
1970 Delano
- The Moonshine War
1970 John W. (Son) Martin
- The Extraordinary Seaman
1969 Lt. J / G Morton Krim
- Paper Lion
1968 George Plimpton
- Premiere
1968 Frank St. John
- Coronet Blue
1967 Clay Breznia
- Where's Everett?
1966 Arnold Barker
- Gone Are the Days!
1963 Charlie Cotchipee
- The Nurses
1962 Dr. John Griffin
- Route 66
1960 Dr. Glazer
- Naked City
1958 Young Poet
