John Mahoney
- Our Flag Means Death
2022 Writer
- The Bathhouse
2013 Thanks
- Flipped
2010 Chet Duncan
- $#*! My Dad Says
2010 Lt. Col. Wally Durham
- Hot in Cleveland
2010 Roy
- In Treatment
2008 Walter Barnett
- Dan in Real Life
2007 Poppy
- Burn Notice
2007 Management
- The Groomsmen
2006 Thanks
- Kronk's New Groove
2005 Papi (voice)
- Fathers and Sons
2005 Gene
- Frasier: Analyzing the Laughter
2004 Martin Crane
- Atlantis: Milo's Return
2003 Whitmore (voice)
- Gary the Rat
2003
- Foyle's War
2002 Andrew Del Mar
- Atlantis: The Lost Empire
2001 Preston Whitmore (voice)
- Almost Salinas
2001 Max Harris
- Intimate Enemies
2000 Narrator (voice)
- Teacher's Pet
2000
- The Iron Giant
1999 General Rogard (voice)
- Antz
1998 Grebs (Drunk Scout) (voice)
- Becker
1998 Father Joe D'Andrea
- Primal Fear
1996 Shaughnessy
- She's the One
1996 Mr. Fitzpatrick
- Star Trek: 30 Years and Beyond
1996 Martin Crane
- Mariette in Ecstasy
1996 Dr. Claude Baptiste
- 3rd Rock from the Sun
1996 Dr. Leonard Hamlin
- The American President
1995 Leo Solomon
- Reality Bites
1994 Grant Gubler
- The Hudsucker Proxy
1994 Chief
- A Hard Rain
1994 Ross Stewart
- ER
1994 Bennett Cray
- Striking Distance
1993 Vince Hardy
- In the Line of Fire
1993 Sam Campagna
- Frasier
1993 Martin Crane
- Article 99
1992 Dr. Henry Dreyfoos
- Buying a Landslide
1992 Walter Partin
- The Water Engine
1992 Mason Gross
- Unnatural Pursuits
1992 Paddy Quinn
- The Secret Passion of Robert Clayton
1992 Robert Clayton Sr.
- The Human Factor
1992 Dr. Alec McMurtry
- Barton Fink
1991 W.P. Mayhew
- The 10 Million Dollar Getaway
1991 Jimmy Burke
- The Russia House
1990 Brady
- The Image
1990 Irv Mickelson
- Love Hurts
1990 Boomer
- H.E.L.P.
1990 Patrick Meacham
- Say Anything...
1989 James Court
- Dinner at Eight
1989 Oliver Jordan
- The Simpsons
1989 Robert Terwilliger, Sr. (voice)
- Betrayed
1988 Shorty
- Eight Men Out
1988 Kid Gleason
- Frantic
1988 Williams
- Favorite Son
1988 Lou Brenner
- American Experience
1988 (voice)
- Moonstruck
1987 Perry
- Tin Men
1987 Moe Adams
- Suspect
1987 Judge Matthew Bishop Helms
- The Hustler of Money
1987 Eddie
- The House of Blue Leaves
1987 Artie Shaughnessy
- Trapped in Silence
1986 Dr. Winslow
- The Manhattan Project
1986 Lt. Col. Conroy
- Streets of Gold
1986 Linehan
- ScreenPlay
1986 Walter Partin
- First Steps
1985 '60 Minutes' Producer
- Code of Silence
1985 Prowler Representative
- The Killing Floor
1984 Thomas Condon
- The Impostor
1984
- Through Naked Eyes
1983 Police Captain
- Chicago Story
1982
- Cheers
1982 Sy Flembeck
- American Playhouse
1982 Thomas Condon
- Hudson Taylor
1981
- Saturday Night Live
1975 Paul Newman / Fast Eddie (uncredited)
