| Movie | 2007 | I Now Pronounce You Chuck & Larry | Councilman Banks | |
| Movie | 1997 | River Made to Drown In | Thaddeus MacKenzie | |
| Movie | 1977 | The Man in the Iron Mask | Louis XIV / Philippe | |
| Movie | 1975 | The Count of Monte-Cristo | Edmond Dantès | |
| Movie | 1973 | The Three Musketeers | Aramis | |
| Movie | 1974 | The Towering Inferno | Simmons | |
| Movie | 1974 | The Four Musketeers | Aramis | |
| Movie | 1986 | Allan Quatermain and the Lost City of Gold | Allan Quatermain | |
| Movie | 2007 | Strength and Honour | Denis O'Leary | |
| Movie | 1985 | King Solomon's Mines | Allan Quatermain | |
| Movie | 1989 | The Return of the Musketeers | Aramis | |
| Movie | 1970 | Julius Caesar | Octavius Caesar / Augustus | |
| Movie | 1968 | Petulia | Dave Danner | |
| Movie | 2000 | Endangered Hawaiʻi | Narrator | |
| Movie | 1976 | The Slipper and the Rose | Prince Edward | |
| Movie | 1978 | The Swarm | Dr. Hubbard | |
| Movie | 2015 | Justice League: Gods and Monsters | Highfather (voice) | |
| Movie | 1982 | Murder by Phone | Nat Bridger | |
| Movie | 1977 | The Last Wave | David Burton | |
| Movie | 1971 | The Music Lovers | Pyotr Ilyich Tchaikovsky | |
| Movie | 2011 | The Perfect Family | Monsignor Murphy | |
| Movie | 1961 | A Thunder of Drums | Lt. Porter | |
| Movie | 1978 | Inside 'the Swarm' | Self | |
| Movie | 1996 | Bird of Prey | Jonathan Griffith | |
| Movie | 1965 | Joy in the Morning | Carl Brown | |
| Movie | 1969 | The Madwoman of Chaillot | The Reverend | |
| Movie | 2012 | We Are the Hartmans | Mr. Hartman | |
| Movie | 1963 | Twilight of Honor | David Mitchell | |
| Movie | 1997 | The Lost Daughter | Andrew McCracken | |
| Movie | 2012 | Three Days of Hamlet | Polonius | |
| Movie | 1960 | The Secret of the Purple Reef | Dean Christopher | |
| Movie | 1991 | Aftermath: A Test of Love | Ross Colburn | |
| Movie | 1991 | Night of the Hunter | Harry Powell | |
| Movie | 2000 | The Pavilion | Huddlestone | |
| Movie | 1972 | Lady Caroline Lamb | George Gordon, Lord Byron | |
| Movie | 1993 | Ordeal in the Arctic | Captain John Couch | |
| Movie | 2014 | Electric Boogaloo: The Wild, Untold Story of Cannon Films | Self - Actor | |
| Movie | 1983 | Cook & Peary: The Race to the Pole | Frederick Cook | |
| Movie | 1974 | The Little Mermaid | Narrator | |
| Movie | 1974 | The Lady's Not for Burning | Thomas Mendip | |
| Movie | 1997 | Barbara Stanwyck: Straight Down The Line | Self (archive footage) | |
| Movie | 1987 | Casanova | Giacomo Casanova | |
| Movie | 1972 | The Woman I Love | King Edward VIII | |
| Movie | 1974 | F. Scott Fitzgerald and the Last of the Belles | F. Scott Fitzgerald | |
| Movie | 2012 | Christmas Around the World with Perry Como | Self | |
| Movie | 2004 | Japan: Memoirs of a Secret Empire | Narrator | |
| Movie | 2017 | The Black Ghiandola | Creepy Oncologist | |
| Movie | 1997 | All the Winters that Have Been | Dane Corvin | |
| Movie | 1996 | The Thorn Birds: The Missing Years | Ralph de Bricassart | |
| Movie | 1991 | Barbara Stanwyck: Fire and Desire | Self (archive footage) | |
| Movie | 2018 | Nightmare Cinema | Dr. Mirari | |
| Movie | 2019 | Finding Julia | Igor | |
| Movie | 2003 | The Making of Shōgun | | |
| Movie | 2020 | Elegies for Angels, Punks and Raging Queens | Nat | |
| Movie | 1979 | Musical Comedy Tonight | | |
| Movie | 1978 | The Good Doctor | Anton Chekhov / Various Roles | |
| Movie | 1982 | Night of 100 Stars | Self | |
| Movie | 1968 | Petulia: The Uncommon Movie | Himself | |
| Movie | 1980 | Shogun | Pilot-Major John Blackthorne | |
| TV Show | 1959 | Bourbon Street Beat | | 1 |
| TV Show | 2004 | Desperate Housewives | Glenn | 1 |
| TV Show | 1952 | Today | Self | 1 |
| TV Show | 1997 | The View | Self | 2 |
| TV Show | 2003 | Nip/Tuck | Arthur Stiles | 1 |
| TV Show | 1962 | The Merv Griffin Show | Self | 1 |
| TV Show | 2004 | Hustle | James Whittaker Wright III | 1 |
| TV Show | 1955 | Gunsmoke | Pete | 1 |
| TV Show | 1978 | Centennial | Alexander McKeag | 12 |
| TV Show | 1998 | Will & Grace | Clyde | 1 |
| TV Show | 1951 | Hallmark Hall of Fame | Hamlet | 1 |
| TV Show | 1955 | Alfred Hitchcock Presents | Clay Pine | 1 |
| TV Show | 1960 | Thriller | Larry Carter | 1 |
| TV Show | 1978 | Challenge of the Super Friends | | 32 |
| TV Show | 1989 | Island Son | | 18 |
| TV Show | 1980 | Shōgun | Pilot-Major John Blackthorne / Anjin-san | 5 |
| TV Show | 1961 | Dr. Kildare | Dr. Kildare | 191 |
| TV Show | 1988 | The Bourne Identity | Jason Bourne | 2 |
| TV Show | 1953 | The Oscars | Self | 2 |
| TV Show | 1986 | Dream West | John Charles Fremont | 3 |
| TV Show | 1991 | The Astronomers | Narrator | 6 |
| TV Show | 1957 | Tonight Starring Jack Paar | Self | 1 |
| TV Show | 1983 | The Thorn Birds | Ralph de Bricassart | 4 |
| TV Show | 1985 | Wallenberg: A Hero's Story | Raoul Wallenberg | 2 |
| TV Show | 2007 | Chuck | Adelbert De Smet | 2 |
| TV Show | 2006 | Brothers and Sisters | Jonathan Byrold | 5 |
| TV Show | 1981 | Wetten, dass..? | Self | 1 |
| TV Show | 1951 | The Red Skelton Show | Clarence Narrow | 1 |
| TV Show | 1956 | Tony Awards | Self - Host/Performer | 1 |
| TV Show | 1956 | Tony Awards | Self - Presenter | 2 |
| TV Show | 1962 | The Tonight Show Starring Johnny Carson | Self | 3 |
| TV Show | 1995 | The Drew Carey Show | Maggie Wick | 2 |
| TV Show | 1990 | Twin Peaks | Bill Kennedy | 1 |
| TV Show | 1950 | The Bob Hope Show | Self | 1 |
| TV Show | 2006 | Blackbeard | Gouverneur Charles Eden | 2 |
| TV Show | 2004 | Japan: Memoirs of a Secret Empire | Narrator | 3 |
| TV Show | 1950 | What's My Line? | Self - Mystery Guest | 1 |
| TV Show | 1999 | Too Rich: The Secret Life of Doris Duke | Bernard Lafferty | 4 |
| TV Show | 1967 | The Carol Burnett Show | Self - Guest | 1 |
| TV Show | 2011 | ThunderCats | Zigg (voice) | 1 |
| TV Show | 1981 | Entertainment Tonight | Self | 1 |
| TV Show | 1956 | Tony Awards | Self - Host | 1 |
| TV Show | 1982 | Champs-Elysées | Self | 1 |
| TV Show | 2008 | Leverage | Archie Leach | 2 |
| TV Show | 1961 | The Mike Douglas Show | Self | 1 |
| TV Show | 1982 | Na sowas! | Self | 1 |
| TV Show | 1994 | Touched by an Angel | Jack Clay / Everett Clay | 1 |
| TV Show | 1944 | Golden Globe Awards | Self - Presenter | 4 |
| TV Show | 1971 | Great Performances | Anton Chekhov | 1 |
| TV Show | 1968 | The Portrait of a Lady | | 6 |
| TV Show | 1944 | Golden Globe Awards | Self - Nominee / Presenter | 1 |
| TV Show | 1944 | Golden Globe Awards | Self - Nominee | 2 |
| TV Show | 1987 | Sacrée soirée | Self | 2 |
| TV Show | 1959 | Mr. Lucky | Alec | 1 |
