John Mahon Filmography
- Actor (44 credits)
- Zodiac (2007) Riverside Captain
- Studio 60 on the Sunset Strip (2006) George
- Zoey 101 (2005) Mr. Bradford
- Just Ask My Children (2001) Judge Ferguson
- Bull (2000) Paul Catteo
- That's Life (2000) Leo
- Angel (1999) Trevor Lockley
- Austin Powers: The Spy Who Shagged Me (1999) NATO Colonel
- Strange World (1999) Agent Milton
- Armageddon (1998) Karl
- Brooklyn South (1997) Gene Donovan
- L.A. Confidential (1997) Police Chief
- The American President (1995) Chairman of the Joint Chiefs
- Natural Selection (1994) Coach Dickler
- Roswell (1994) Red Hat Vet
- Lifepod (1993) Earth Corp Ship Commander
- Space Rangers (1993) Amb. Hardcastle
- Cutters (1993) Dave
- One False Move (1992) Chief Jenkins
- Final Shot: The Hank Gathers Story (1992) LMU Coach
- Murder Without Motive: The Edmund Perry Story (1992) Inspector Hedges
- Sinatra (1992) Mr. Cleaves
- Homefront (1991) Bus Driver
- The People Under the Stairs (1991) Police Sergeant
- Bad Influence (1990) Dr. Fielding
- Equal Justice (1990) Detective Stassen
- Mancuso, FBI (1989)
- Midnight Train to Moscow (1989) Cabinet Member
- Shakedown on the Sunset Strip (1988) Deputy Chief Evans
- Six Against the Rock (1987) Officer Bill Miller
- Hooperman (1987) Chapell
- The Couch Trip (1987) Police Captain
- Convicted: A Mother's Story (1987)
- Betrayed by Innocence (1986) Bailiff
- Misfits of Science (1985) Technician
- Stingray (1985) Desk Sgt.
- Victims for Victims: The Theresa Saldana Story (1984)
- Automan (1983) The Policeman
- Manimal (1983) Man
- A Killing Affair (1977) Det, Shoup
- Collision Course: Truman vs. MacArthur (1976) Gen. Hoyt Vandenberg
- The Blue Knight (1975) SWAT Commander
- The Rockford Files (1974) Lt. Hayes
- The Exorcist (1973) Language Lab Director
