Filmography
| Year | Title | Role |
| 2023 | Miranda's Victim (2023) | Judge Wren |
| 2023 | Ozi: Voice of the Forest (2024) | Albino Crocodile |
| 2022 | Moonfall (2022) | Holdenfield |
| 2022 | Mr. Harrigan's Phone (2022) | Mr. Harrigan |
| 2019 | American Hangman | Judge Straight |
| 2019 | Ad Astra | Thomas Pruitt |
| 2019 | The Burnt Orange Heresy | Jerome Debney |
| 2018 | Measure Of A Man | Dr. Kahn |
| 2017 | The Leisure Seeker | John Spencer |
| 2017 | Basmati Blues | Gurgon |
| 2016 | Milton's Secret | Grandpa Howard |
| 2015 | The Hunger Games: Mockingjay - Part 2 | President Snow |
| 2015 | Forsaken | Reverend William Clayton |
| 2014 | The Hunger Games: Mockingjay - Part 1 | President Snow |
| 2014 | The Calling | Father Price |
| 2013 | The Hunger Games: Catching Fire | President Snow |
| 2013 | Jappeloup | John Lester |
| 2013 | The Best Offer | Billy Whistler |
| 2012 | The Hunger Games (2012) | President Snow |
| 2012 | Assassin's Bullet | Ambassador Ashdown |
| 2011 | The Eagle | Uncle Aquila |
| 2011 | Horrible Bosses | Jack Pellit |
| 2011 | The Mechanic | Harry |
| 2011 | Man on the Train | The Professor |
| 2010 | Out of the Shadows | Voice |
| 2009 | Astro Boy | Stone |
| 2008 | Fool's Gold | Nigel Honeycutt |
| 2007 | Reign Over Me | Judge Raines |
| 2007 | Dinosaures: Giants of the Patagonia | Narrator |
| 2007 | Puffball | Lars |
| 2007 | Trumbo (2008) | Actor |
| 2006 | Ask the Dust | Hellfrick |
| 2006 | Land of the Blind | Thorne |
| 2005 | American Gun | Carl |
| 2005 | Pride and Prejudice (2005) | Mr. Bennet |
| 2005 | Fierce People | Ogden C. Osborne |
| 2005 | An American Haunting (2006) | John Bell |
| 2005 | Aurora Borealis | Ronald |
| 2003 | The Italian Job (2003) | John Bridger |
| 2003 | Cold Mountain | Reverend Monroe |
| 2002 | Path to War | Clark Clifford |
| 2001 | Final Fantasy: The Spirits Within | Doctor Cid |
| 2001 | Big Shot's Funeral | Tyler |
| 2000 | Space Cowboys | Jerry O'Nell |
| 2000 | The Art of War | Douglas Thomas |
| 1999 | Instinct | Ben Hillard |
| 1999 | Virus (2019) | Capt. Robert Everton |
| 1998 | Without Limits | Bill Bowerman |
| 1996 | A Time to Kill | Lucien Wilbanks |
| 1995 | Citizen X | Col. Mikhail Fetisov |
| 1995 | Outbreak (1995) | Maj. Gen. Donald McClintock |
| 1994 | Disclosure | Bob Garvin |
| 1993 | Six Degrees of Separation | Flan |
| 1993 | Le Fleuve aux grandes eaux | Narrator |
| 1993 | The Benefit of the Doubt (Une part d'ombre) | Frank |
| 1992 | Buffy the Vampire Slayer | Merrick Jamison-Smythe |
| 1991 | JFK | X |
| 1991 | Backdraft | Ronald Bartel |
| 1991 | Scream of Stone | Ivan |
| 1991 | Buster's Bedroom | O'Connor |
| 1990 | Bethune: The Making of a Hero | Dr. Norman Bethune |
| 1989 | A Dry White Season | Ben du Toit |
| 1987 | Apprentice to Murder | John Reese |
| 1985 | Revolution (1985) | Sgt. Maj. Peasy |
| 1984 | Crackers | Weslake |
| 1980 | Ordinary People | Calvin Jarrett |
| 1979 | Murder by Decree | Robert Lees |
| 1978 | Animal House | Prof. Dave Jennings |
| 1978 | The Great Train Robbery (1903) | Agar |
| 1978 | Terror Tuesday: Invasion of the Body Snatchers | Matthew Bennell |
| 1977 | The Kentucky Fried Movie | The Clumsy Waiter |
| 1977 | Bethune | Dr. Norman Bethune |
| 1977 | Blood Relatives | Steve Carella |
| 1976 | 1900 | Attila Mellanchini |
| 1976 | Fellini's Casanova | Giacomo Casanova |
| 1976 | The Cinema According to Bertolucci | Actor |
| 1975 | The Day of the Locust | Homer Simpson |
| 1975 | End of the Game | Corpse of Lt. Robert Schmied |
| 1973 | Don't Look Now | John Baxter |
| 1973 | Steelyard Blues | Jesse Veldini |
| 1972 | F.T.A. | Producer, Self |
| 1971 | Klute | John Klute |
| 1971 | Little Murders | Rev. Dupas |
| 1970 | M*A*S*H | "Hawkeye" Pierce |
| 1970 | Kelly's Heroes | Sgt. Oddball |
| 1970 | Alex in Wonderland | Alex Morrison |
| 1970 | Start the Revolution Without Me | Charles/Pierre |
| 1970 | Act of the Heart | Father Michael Ferrier |
| 1968 | Oedipus the King | Chorus Leader |
| 1968 | Sebastian (1968) | Ackerman |
| 1968 | The Split | Dave Negli |
| 1967 | The Dirty Dozen (1967) | Vernon L. Pinkley |
| 1965 | Dr. Terror's House of Horrors | Bob Carroll |
| 1965 | Die! Die! My Darling! | Joseph |
| 1965 | The Bedford Incident | Hospitalman Nerney |
