 | Arthur Miller: Writer (2017) as Self (archive footage) |
 | All Governments Lie: Truth, Deception, and the Spirit of I.F. Stone (2016) as Ben Bradlee (archive footage) |
 | Metallica: The Videos 1989-2004 (2006) as Joe's Father (video "One") |
 | Eugene O’Neill: A Documentary Film (2006) as Self |
 | Sam Peckinpah's West: Legacy of a Hollywood Renegade (2004) as Self (archive footage) |
 | Going Home (2000) as Charles Barton |
 | Once Upon a Time: Sergio Leone (2000) as Self (archive footage) |
 | That Moment: Magnolia Diary (2000) as Self |
 | Magnolia (1999) as Earl Partridge |
 | Mein liebster Feind (1999) as Self (archive footage) |
 | Enemy of the State (1998) as Congressman Phillip Hammersley (uncredited) |
 | Beloved (1998) as Mr. Bodwin |
 | The Real Macaw (1998) as Grandpa Girdis |
 | Heartwood (1998) as Logan Reeser |
 | Truman (1997) as Narrator (voice) |
 | A Thousand Acres (1997) as Larry Cook |
 | T.R.: The Story of Theodore Roosevelt (1996) as Narrator |
 | Journey (1995) as Marcus |
 | Crimson Tide (1995) as Rear Admiral Anderson (uncredited) |
 | My Antonia (1995) as Josea Burden |
| | The Great American West (1995) as Narrator (voice) |
 | The Enemy Within (1994) as General R. Pendleton Lloyd |
 | Little Big League (1994) as Thomas Heywood |
 | The Paper (1994) as Graham Keighley |
 | Over Washington D.C.: Our Nation's Capital (1994) as Narrator |
 | La Classe américaine (1993) as The Newspaper Director (archive footage) |
 | Philadelphia (1993) as Charles Wheeler |
 | Heidi (1993) as Großvater |
 | Sam Peckinpah: Man of Iron (1993) as Self |
 | The Trial (1993) as Doctor Huld |
 | The Adventures of Huck Finn (1993) as The King |
| | Lincoln (1992) as President Abraham Lincoln (voice) |
| | The Peoples Palace: Secrets of the New York Public Library (1992) as Self - Narrator (voice) |
 | Storyville (1992) as Clifford Fowler |
 | When It Was a Game 2 (1992) as Passage Narrator (voice) |
 | Deceptions (1992) as Clay (voice) |
 | Mark Twain and Me (1991) as Mark Twain |
 | Empire of the Air: The Men Who Made Radio (1991) as Narrator (voice) |
 | Rabbit Ears - Jonah and the Whale (1991) as Narrator (voice) |
| | When It Was a Game (1991) as (voice) |
 | Chernobyl: The Final Warning (1991) as Dr. Armand Hammer |
 | The Perfect Tribute (1991) as President Abraham Lincoln |
 | Quick Change (1990) as Chief Rotzinger |
 | Night of 100 Stars III (1990) as Self |
 | Black Rainbow (1989) as Walter Travis |
 | Thomas Hart Benton (1989) as Narrator (voice) |
 | Parenthood (1989) as Frank Buckman |
 | Reunion (1989) as Henry Strauss |
 | Dream a Little Dream (1989) as Coleman Ettinger |
 | The Christmas Wife (1988) as John Tanner |
 | The Good Mother (1988) as W. O. Muth |
 | Bright Lights, Big City (1988) as Mr. Hardy (uncredited) |
 | Inherit the Wind (1988) as Harry Drummond |
 | Breaking Home Ties (1987) as Lloyd Wells |
 | Laguna Heat (1987) as Wade Shephard |
 | Happy 100th Birthday, Hollywood (1987) as Self |
 | Square Dance (1987) as Dillard |
 | The Last Frontier (1986) as Ed Stenning |
 | Johnny Bull (1986) as Stephan Kovacs |
 | Werner Herzog: Filmemacher (1986) as Self (archive footage) |
 | Empire City (1985) as Self - Narrator (voice) |
 | The World of Tomorrow (1984) as Self / Narrator |
 | You Can't Take it With You (1984) as Grandpa Martin Vanderhof |
| | America and Lewis Hine (1984) as Voice |
 | Sakharov (1984) as Andrei Sakharov |
 | The Day After (1983) as Dr. Russell Oakes |
| | The Time of Our Lives: The Most Amazing 60 Years in History (1983) as Self - Host |
 | Something Wicked This Way Comes (1983) as Charles Halloway |
 | Max Dugan Returns (1983) as Max Dugan |
 | Burden of Dreams (1982) as Fitzcarraldo (archive footage) |
 | Night of 100 Stars (1982) as Self |
 | The Legend of the Lone Ranger (1981) as President Ulysses S. Grant |
 | Melvin and Howard (1980) as Howard Hughes |
 | Ghosts of Cape Horn (1980) as Narrator |
 | Raise the Titanic (1980) as Admiral James Sandecker |
 | F.D.R.: The Last Year (1980) as President Franklin D. Roosevelt |
 | Haywire (1980) as Leland Hayward |
 | Caboblanco (1980) as Gunther Beckdorff |
 | Hurricane (1979) as Capt. Charles Bruckner |
 | A Christmas to Remember (1978) as Daniel Larson |
 | Comes a Horseman (1978) as Jacob 'J.W.' Ewing |
 | Julia (1977) as Dashiell Hammett |
 | Tod eines Fremden (1976) as Inspector Barkan |
 | All the President's Men (1976) as Ben Bradlee |
 | Addie and the King of Hearts (1976) as James "Jamie" Mills |
 | Mr. Sycamore (1975) as John Gwilt |
 | A Moon for the Misbegotten (1975) as James Tyrone Jr. |
 | The Easter Promise (1975) as James "Jamie" Mills |
 | A Boy and His Dog (1975) as Lou Craddock |
 | The Country Girl (1974) as Frank Elgin |
 | The Thanksgiving Treasure (1973) as James "Jamie" Mills |
 | Pat Garrett & Billy the Kid (1973) as Governor Wallace |
 | Old Faithful (1973) as Jason Robards |
 | The House Without a Christmas Tree (1972) as James "Jamie" Mills |
 | The War Between Men and Women (1972) as Stephen Kozlenko |
 | Johnny Got His Gun (1971) as Joe's Father |
 | Murders in the Rue Morgue (1971) as Cesar Charron |
 | Fools (1970) as Matthew South |
 | Julius Caesar (1970) as Marcus Brutus |
 | The Ballad of Cable Hogue (1970) as Cable Hogue |
 | Rosolino Paternò, soldato... (1970) as Sam Armstrong |
 | Tora! Tora! Tora! (1970) as General Walter C. Short |
 | The Night They Raided Minsky's (1968) as Raymond Paine |
 | C'era una volta il West (1968) as 'Cheyenne' |
 | Isadora (1968) as Paris Singer |
 | Hour of the Gun (1967) as Doc Holliday |
 | The Belle of 14th Street (1967) as Performer |
 | The St. Valentine's Day Massacre (1967) as Al Capone |
 | Divorce American Style (1967) as Nelson Downes |
| | The Strange Case of Dr. Jekyll and Mr. Hyde (1967) as Dr. Henry Jekyll / Mr. Edward Hyde |
 | Noon Wine (1966) as Royal Earle Thompson |
 | Any Wednesday (1966) as John Cleves |
 | A Big Hand for the Little Lady (1966) as Henry Drummond |
 | The Face of Genius (1966) as Narrator (voice) |
 | A Thousand Clowns (1965) as Murray |
 | Abe Lincoln in Illinois (1964) as Abraham Lincoln |
 | Act One (1963) as George S. Kaufman |
 | Long Day's Journey Into Night (1962) as Jamie Tyrone |
 | Tender Is the Night (1962) as Dick Diver |
 | By Love Possessed (1961) as Julius Penrose |
 | The Iceman Cometh (1960) as Theodore "Hickey" Hickman |
 | The Bat (1960) as Detective Anderson |
 | A Doll's House (1959) as Dr. Rank |
 | For Whom the Bell Tolls (1959) as Robert Jordan |
 | The Journey (1959) as Paul Kedes |
