| Cannes, 60 ans d'histoires | Himself (archive footage) |
| "Great Books" | Narrator |
| The Bennets | Himself |
| On Set Diaries | Himself |
| "Dirty Sexy Money" | Tripp Darling |
| Sleepwalkers | Businessman struck by a taxi |
| "Great Books" | Narrator |
| "Great Books" | Narrator |
| "The Saint" | James McCleary / ... (2 episodes, 1965-1966) |
| The World Ten Times Over | Unnamed (In Nightclub) |
| Castello dei morti vivi, Il | Sgt. Paul / The witch / The old man |
| Hamlet | Fortinbras, Prince of Norway |
| The Bedford Incident | Hospitalman Nerney - Sick Bay |
| Fanatic | Joseph |
| Dr. Terror's House of Horrors | Bob Carroll |
| Promise Her Anything | Autograph Seeking Father (uncredited) |
| Billion Dollar Brain | Scientist at computer |
| The Dirty Dozen | Vernon Pinkley |
| "Man in a Suitcase" | Earle / ... (2 episodes, 1967-1968) |
| Interlude | Lawrence |
| Joanna | Lord Peter Sanderson |
| Oedipus the King | Chorus Leader |
| Sebastian | Ackerman |
| The Split | Dave Negli |
| The Sunshine Patriot | Benedeck |
| Act of the Heart | Father Michael Ferrier |
| Alex in Wonderland | Alex Morrison |
| Kelly's Heroes | Sgt. Oddball (tank commander) |
| MASH | Capt. Benjamin Franklin 'Hawkeye' Pierce |
| Start the Revolution Without Me | Charles / Pierre |
| Johnny Got His Gun | Christ |
| Klute | John Klute |
| Little Murders | Rev. Dupas |
| FTA | Himself |
| Alien Thunder | Sgt. Dan Candy |
| Don't Look Now | John Baxter |
| Lady Ice | Andy Hammon |
| Steelyard Blues | Jesse Veldini |
| S*P*Y*S | Bruland |
| Bertolucci secondo il cinema | |
| The Day of the Locust | Homer Simpson |
| Novecento | Attila Mellanchini |
| Casanova di Federico Fellini, Il | Giacomo Casanova |
| The Eagle Has Landed | Liam Devlin |
| Richter und sein Henker, Der | Corpse of Lt. Robert Schmied |
| Bethune | Dr. Norman Bethune |
| The Disappearance | Jay Mallory |
| The Kentucky Fried Movie | The Clumsy Waiter (segment "That's Armageddon") |
| Liens de sang, Les | Carella |
| Invasion of the Body Snatchers | Matthew Bennell |
| Animal House | Prof. Dave Jennings |
| Bear Island | Frank Lansing |
| The First Great Train Robbery | Robert Agar |
| A Man, a Woman and a Bank | Reese Halperin |
| Murder by Decree | Robert Lees |
| Nothing Personal | Roger Keller |
| Ordinary People | Calvin Jarrett |
| Eye of the Needle | Heinrich 'Henry' Faber |
| Gas | Nick the Noz |
| Threshold | Dr. Vrain |
| Max Dugan Returns | Brian Costello |
| The Winter of Our Discontent | Ethan Hawley |
| Crackers | Weslake |
| Ordeal by Innocence | Dr. Arthur Calgary |
| Terror in the Aisles | Matthew Bennell (Invasion of the Body Shatchers (1978) (archive footage) |
| Heaven Help Us | Brother Thadeus |
| Revolution | Sgt. Maj. Peasy |
| Oviri | Paul Gauguin |
| The Rosary Murders | Father Robert Koesler |
| The Trouble with Spies | Appleton Porter |
| Apprentice to Murder | John Reese |
| A Dry White Season | Ben du Toit |
| Lock Up | Warden Drumgoole |
| Lost Angels | Dr. Charles Loftis |
| Bethune: The Making of a Hero | Dr. Norman Bethune |
| Buster's Bedroom | O'Connor |
| Backdraft | Ronald Bartel |
| Eminent Domain | Josef Borski |
| JFK | X |
| Long Road Home | (uncredited) |
| Cerro Torre: Schrei aus Stein | Ivan |
| Buffy the Vampire Slayer | Merrick Jamison-Smythe |
| Quicksand: No Escape | Murdoch |
| The Railway Station Man | Roger Hawthorne |
| Shadow of the Wolf | Henderson |
| Benefit of the Doubt | Frank |
| Fleuve aux grandes eaux, Le | Narrator (voice: English version)) |
| Six Degrees of Separation | John Flanders ('Flan') Kittredge |
| Younger and Younger | Jonathan Younger |
| A Century of Cinema | Himself |
| Disclosure | Bob Garvin |
| The Lifeforce Experiment | Dr. 'MAC' MacLean |
| Oldest Living Confederate Widow Tells All | Capt. William Marsden |
| Punch | Craman |
| The Puppet Masters | Andrew Nivens |
| Citizen X | Col. Mikhail Fetisov |
| Hollow Point | Garrett Lawton |
| Outbreak | Maj. Gen. Donald McClintock |
| Red Hot | Kirov |
| A Time to Kill | Lucien Wilbanks |
| The Assignment | Jack Shaw / Henry Fields |
| Fallen | Lt. Stanton |
| Natural Enemy | Ted Robards |
| Without Limits | Bill Bowerman |
| Shadow Conspiracy | Jacob Conrad |
| Virus | Captain Robert Everton |
| Free Money | Judge Rolf Rausenberger |
| Virus | Captain Robert Everton |
| Instinct | Ben Hillard |
| A War Story | Narrator of the diary (voice) |
| Instinct | Ben Hillard |
| The American Film Institute Salute to Frank Capra | Himself |
| The American Film Institute Salute to Clint Eastwood | Himself |
| Cold Mountain | Reverend Monroe |
| The Art of War | Douglas Thomas |
| The Hunley | Gen. Pierre G.T. Beauregard |
| North China Commune | Narrator (voice) |
| Final Fantasy: The Spirits Within | Dr. Cid |
| Behind the Mask | Dr. Bob Shushan |
| Spirale, La | Narrator on English Release (voice) |
| Space Cowboys | Jerry O'Neill |
| Rakuyô | John Williams |
| Rakuyô | John Williams |
| Panic | Michael |
| "Great Books" | Narrator (4 episodes, 1996-1999) |
| Kate Bush: The Whole Story | Papa (clip: Cloudbusting) (archive footage) |
| Path to War | Clark Clifford |
| Give Me Your Answer True | Himself |
| North China Factory | Narrator (voice) |
| Wuxing People's Commune | Narrator (voice) |
| Roger Moore: A Matter of Class | Himself (archive footage) |
| The Poky Little Puppy's First Christmas | Narrator |
| The Shadow Catcher | Edward S. Curtis (voice) |
| Threads of Hope | Narrator (voice) |
| The American Civil War | Himself |
| Uprising | Adam Czerniaków |
| People of the Forest: The Chimps of Gombe | Narrator |
| "American Masters" | Himself - Actor |
| Operation Dirty Dozen | Himself (uncredited) |
| "The Prize: The Epic Quest for Oil, Money & Power" | |
| The Big Heist | Jimmy Burke |
| Da wan | Tyler |
| AFI's 100 Years, 100 Thrills: America's Most Heart-Pounding Movies | Himself |
| "Queen Victoria's Empire" | Narrator (4 episodes, 2001) |
| Virus: Ghost in the Machine | Himself |
| The Making of 'Space Cowboys' | |
| The 74th Annual Academy Awards | Himself - Announcer |
| Baltic Storm | Lou Aldryn |
| Fellini: Je suis un grand menteur | Casanova |
| The Italian Job | John Bridger |
| Klute in New York: A Background for Suspense | Himself |
| The Kennedy Center Honors: A Celebration of the Performing Arts | Himself - Presenter: Helen Hayes |
| The Kennedy Center Honors: A Celebration of the Performing Arts | Himself |
| Twentieth Century Fox: The Blockbuster Years | Capt. Benjamin Franklin 'Hawkeye' Pierce |
| The 49th Annual Academy Awards | Himself - Presenter: Best Cinematography |
| 2000 Blockbuster Entertainment Awards | Himself |
| The 38th Annual Golden Globe Awards | Himself - Nominee: Best Actor in a Motion Picture [Drama] |
| The 61st Annual Academy Awards | Himself - Co-Presenter: Honorary Award to the National Film Board of Canada |
| The American Movie Awards | Himself - Presenter |
| Night of 100 Stars | Himself |
| 'Salem's Lot | Richard Straker |
| Piazza delle cinque lune | Rosario Sarracino |
| "Frankenstein" | Captain Walton |
| The War of the Worlds: Great Books | Narrator (voice) |
| Sex at 24 Frames Per Second | Himself (archive footage) |
| Ask the Dust | Hellfrick |
| Aurora Borealis | Ronald Shorter |
| Terry-Thomas | |
| "A Farewell to Arms" | Sim |
| Lord of War | Colonel Oliver Southern (voice) |
| The Life and Times of Arthur Erickson | Himself |
| Fierce People | Ogden C. Osborne |
| The Magic of Fellini | Himself (archive footage) |
| Pride & Prejudice | Mr. Bennet |
| American Gun | Carl Wilk |
