| — | NBC Experiment in Television | voice |
| 2022 | Dracula Unearthed | Dr. Jack Seward (archive footage) |
| 2010 | Never Sleep Again: The Elm Street Legacy | Self (archive footage) |
| 2010 | Halloween: The Inside Story | Self (archive footage) |
| 2003 | Halloween: A Cut Above the Rest | Self / Dr. Samuel 'Sam' Loomis (archive footage) |
| 2002 | Best Ever Bond | Blofeld (archive footage) (uncredited) |
| 1998 | In and Out of Fashion | Self (archive footage) |
| 1996 | Fatal frames | Professor Robinson |
| 1995 | Halloween 6 : La Malédiction de Michael Myers | Dr. Sam Loomis |
| 1995 | Safe Haven | The Sailor |
| 1995 | Signs and Wonders | Cornelius Van Damm |
| 1994 | Guinevere | Merlin |
| 1994 | Freeze: But is it Art? | Sinister Dentist |
| 1993 | Le voleur et le cordonnier | Phido the Vulture (voice) |
| 1993 | L'Heure du Cochon | Pincheon |
| 1993 | The Big Freeze | Soup slurper |
| 1993 | Femme Fatale | Victor Harty |
| 1992 | Diên Biên Phu | Howard Simpson |
| 1991 | Ombres et Brouillard | Doctor |
| 1991 | Miliardi | Ripa |
| 1991 | L'avvoltoio può attendere | The Art Collector |
| 1991 | Donne armate | Dreyfuss |
| 1990 | Moi, général de Gaulle | Winston Churchill |
| 1989 | Halloween 5 : La Revanche de Michael Myers | Dr. Sam Loomis |
| 1989 | Paganini Horror | Mr. Pickett |
| 1989 | Ten Little Indians | Mr. Justice Lawrence Wargrave |
| 1989 | La Rivière de la mort | Heinrich Spaatz |
| 1989 | Miss Marple : L'Œil de verre | Jason Rafiel |
| 1989 | Buried Alive | Dr. Schaeffer |
| 1989 | American risciò | Rev. Mortom |
| 1989 | The House of Usher | Walter Usher |
| 1989 | Casablanca Express | Colonel Bats |
| 1988 | Halloween 4 : Le Retour de Michael Myers | Dr. Sam Loomis |
| 1988 | Nosferatu à Venise | Don Alvise |
| 1988 | Un delitto poco comune | Inspector Datti |
| 1988 | Le Triangle de la peur | Henry Carlson |
| 1988 | La Grande Évasion 2 - L'Histoire enfin révélée | Dr. Absalon |
| 1988 | Animali metropolitani | Prof. Livingstone |
| 1988 | Angel Hill: l'ultima missione | Colonel B. Abrahams |
| 1988 | La guerre d'Hanna | Captain Thomas Rosza |
| 1988 | The Great Escape II: The Untold Story | Dr. Absalon |
| 1987 | Prince des ténèbres | Father Loomis |
| 1987 | Django 2 : Le Grand Retour | Ben Gunn |
| 1987 | Warrior Queen | Clodius Flaucus |
| 1987 | Spettri | Professor Lasky |
| 1987 | Cibles à abattre | Sen. Blaster |
| 1987 | Ground Zero | Prosper Gaffney |
| 1987 | Basements | Mr. Kidd (segment "The Room") |
| 1987 | Scoop | Lord Copper |
| 1987 | Gila and Rik | Joe Gardenia |
| 1986 | To Kill a Stranger | Col. Kostik |
| 1986 | Commando Cobra | Father Lenoir |
| 1986 | Into the Darkness | David Beckett |
| 1986 | Onora il Padre | Aldo Rossi |
| 1986 | Naso di cane | Olindo Cuomo |
| 1985 | Phenomena | Professor John McGregor |
| 1985 | Où est passée Jessica ? | Commissioner Danesi |
| 1985 | Ray Bradbury présente | George Hill |
| 1985 | Les diamants de l'Amazone | Klaus von Blantz |
| 1985 | L'Ambassadeur | Minister Eretz |
| 1985 | Arch of Triumph | Ivon Haake |
| 1985 | Il mondo dell'orrore di Dario Argento | Self (Archive) |
| 1985 | Reel Horror | Axel MacGregor (archive footage) |
| 1985 | Black Arrow | Sir Oliver Oates |
| 1985 | The Corsican Brothers | The Chancellor |
| 1984 | Terreur dans la salle | Self - Host |
| 1984 | Une Race A Part | J.P. Whittier |
| 1984 | Frankenstein's Great Aunt Tillie | Victor Frankenstein / Baron Frankenstein |
| 1984 | Maitresse du jeu | Salomon Van der Merwe |
| 1984 | Where Is Parsifal? | Mackintosh |
| 1984 | Miss Marple | Jason Rafiel |
| 1983 | Le Chevalier du Monde perdu | Prossor |
| 1983 | The Devonsville Terror | Dr. Warley |
| 1983 | The Falklands Factor | Dr. Samuel Johnson |
| 1982 | Dément | Leo Bain |
| 1982 | Witness for the Prosecution | Mr. Myers |
| 1982 | Wogan | Self |
| 1982 | The Barchester Chronicles | |
| 1982 | Computercide | George Dettler |
| 1981 | New York 1997 | President of the United States |
| 1981 | Halloween 2 | Dr. Sam Loomis |
| 1981 | Le Club des monstres | Pickering, Chief of the B-Squad |
| 1981 | À la recherche du Yankee Zéphyr | Gilbert Carson |
| 1980 | L'Incroyable Homme Puma | Kobras |
| 1980 | Salade russe et crème anglaise | Professor John Cavendish |
| 1979 | Dracula | Dr. Jack Seward |
| 1979 | À l'ouest, rien de nouveau | Kantorek |
| 1979 | L'Homme en colère | Albert Rumpelmayer |
| 1979 | Good Luck, Miss Wyckoff | Dr. Steiner |
| 1979 | Nom de code Jaguar | General Villanova |
| 1979 | Madame Columbo | |
| 1979 | Dick le rebelle | |
| 1979 | Gold of the Amazon Women | Clarence Blasko |
| 1979 | The French Atlantic Affair | Max Dechambre |
| 1979 | Better Late Than Never | Colonel Riddle |
| 1978 | La nuit des masques | Dr. Sam Loomis |
| 1978 | Sgt. Pepper's Lonely Hearts Club Band | B.D. Brockhurst |
| 1978 | Colorado | Sam Purchas |
| 1978 | Les Liens du sang | James Doniac |
| 1978 | Le jeu de la puissance | Blair |
| 1978 | Tomorrow Never Comes | Dr. Todd |
| 1978 | The Dark Secret of Harvest Home | Narrator (voice) |
| 1978 | Night Creature | Axel MacGregor |
| 1978 | L'Ordre et la sécurité du monde | Rothko |
| 1978 | The Bastard | Solomon Sholto |
| 1978 | The Defection of Simas Kudirka | Capt. Vladimir Popov |
| 1977 | Jésus de Nazareth | Melchior |
| 1977 | Oh, God! | Doctor Harmon |
| 1977 | Un espion de trop | Nicolai Dalchimsky |
| 1977 | Les Chats du diable | Valentine De'ath (segment 3 "Hollywood 1936") |
| 1976 | L'aigle s'est envolé | Himmler |
| 1976 | Le Dernier Nabab | Boxley |
| 1976 | La Secte des morts-vivants | Father Roche |
| 1976 | Evil baby - The devil within her | Dr. Finch |
| 1976 | The Passover Plot | Pontius Pilate |
| 1976 | Trial by Combat | Sir Giles Marley |
| 1976 | Goldenrod | John Tyler Jones |
| 1976 | Meriel the Ghost Girl | George Livingston |
| 1976 | Hindle Wakes | Nat Jeffcote |
| 1976 | Laurence Olivier Presents | Nat Jeffcote |
| 1975 | Saturday Night Live | Self - Host |
| 1975 | La Montagne ensorcelée | Lucas Deranian |
| 1975 | Le Comte de Monte-Cristo | Danglars |
| 1975 | Hearts of the West | A.J. Nietz |
| 1975 | Le Voyage de la peur | Kuvetli |
| 1975 | Peep Show | |
| 1974 | Attention, on va s'fâcher ! | Doctor |
| 1974 | Frissons d'outre-tombe | Jim Underwood |
| 1974 | Contre une poignée de diamants | Cedric Harper |
| 1974 | Mutations | Professor Nolter |
| 1974 | Barry McKenzie Holds His Own | Erich Count von Plasma |
| 1974 | La loba y la Paloma | Martin Zayas |
| 1974 | Playhouse | |
| 1974 | Playhouse | George Livingston |
| 1974 | Occupations | Christo Kabak |
| 1973 | Les Contes aux limites de la folie | Prof. R.C. Tremayne |
| 1973 | La Crique de Malachi | Malachi |
| 1973 | Dr Jekyll et Mr Hyde | Fred Smudge |
| 1973 | Orson Welles' Great Mysteries | Cawser |
| 1973 | Lonely Water | The Spirit (voice) |
| 1973 | The Rainbow Boys | Ralph Logan |
| 1972 | Le Métro de la mort | Inspector Calhoun |
| 1972 | Le Joueur de flûte | The Baron |
| 1972 | Henry VIII and His Six Wives | Thomas Cromwell |
| 1972 | Wedding in White | Jim Dougall, Sr. |
| 1972 | Innocent Bystanders | Loomis |
| 1972 | The Jerusalem File | |
| 1971 | THX 1138 | SEN |
| 1971 | Columbo | Adrian Carsini |
| 1971 | Réveil dans la terreur | Doc Tydon |
| 1971 | Kidnappé | Ebenezer Balfour |
| 1971 | Les Rivaux de Sherlock Holmes | Carnacki |
| 1971 | Skin Deep | Gerry Muddiman |
| 1971 | The Fox Trot | Tom |
| 1970 | Soldat Bleu | Isaac Q. Cumber |
| 1970 | Play for Today | Samuel Johnson |
| 1970 | Play for Today | Gerry Muddiman |
| 1969 | Mister Freedom | Dr. Freedom |
| 1969 | La Folle de Chaillot | The Prospector |
| 1969 | Arthur? Arthur! | Arthur Brownjohn / Sir Easonby 'E' Mellon |
| 1969 | Last to Go | |
| 1968 | Hawaï police d'État | Hans Vogler |
| 1968 | Creature of Comfort | James Thorne |
| 1968 | Sleep is Lovely | Clive |
| 1968 | The News-Benders | J.G. |
| 1967 | On ne vit que deux fois | Ernst Stavro Blofeld |
| 1967 | La Nuit des généraux | General Kahlenberge |
| 1967 | Will Penny, le solitaire | Preacher Quint |
| 1967 | Mission T.S. | Gregori Andreanu |
| 1967 | The Diary of Anne Frank | Albert Dussel |
| 1967 | Call Me Daddy | Ben Hoffman |
| 1966 | Le voyage fantastique | Dr. Michaels |
| 1966 | Cul-de-sac | George |
| 1966 | Le Mystère des treize | Pere Dominic |
| 1965 | La Plus Grande Histoire jamais contée | The Dark Hermit - Satan |
| 1965 | Sur la piste de la grande caravane | 'Oracle' Jones |
| 1965 | Thirty-Minute Theatre | |
| 1964 | Le Gardien | Mac Davies / Bernard Jenkins |
| 1963 | La Grande Évasion | Blythe 'The Forger' |
| 1963 | Au-delà du réel | Harold J. Finley |
| 1963 | Le Fugitif | Max Pfeiffer |
| 1963 | Dr. Crippen | Dr. Hawley Harvey Crippen |
| 1963 | Espionage | |
| 1962 | The Inspector | Wolters |
| 1961 | Quel dépecer ! | Everett Sloane |
| 1961 | The Defenders | Dr. Byron Saul |
| 1961 | No Love for Johnnie | Renfrew |
| 1961 | Spare the Rod | Mr. Jenkins |
| 1961 | The Horsemasters | Captain Pinski |
| 1961 | The Wind of Change | Pop |
| 1960 | Le Cirque des horreurs | Vanet |
| 1960 | L'Impasse aux violences | William Hare |
| 1960 | Amants et Fils | Mr. Pappleworth |
| 1960 | L'enfer est une ville | Gus Hawkins |
| 1960 | La guerre des sexes | Irwin Hoffman |
| 1960 | Destination Danger | |
| 1960 | Suspect | Parsons, alias Bill Brown |
| 1960 | Les Mains d'Orlac | Graham Coates |
| 1960 | The Shakedown | Jessel Brown |
| 1960 | Une histoire de David | Nabal |
| 1960 | The Big Day | Victor Partridge |
| 1960 | The Cupboard | Fred Watson |
| 1960 | Toff and Fingers | Self/Host |
| 1960 | Alice Through the Looking Box | Caterpillar |
| 1960 | Armchair Mystery Theatre | Host |
| 1959 | La Quatrième Dimension | Ellis Fowler |
| 1959 | Les corps sauvages | Hurst |
| 1959 | One Step Beyond | Harvey Laurence |
| 1959 | Les Aventuriers du Kilimandjaro | Captain |
| 1959 | Ici interpol | Karl Haussman |
| 1959 | The Traitor | Grantley Caypor |
| 1958 | A Tale of Two Cities | Barsad |
| 1958 | Chef de réseau | Gen. Hardt |
| 1958 | Le Vent Ne Sait Pas Lire | Doctor |
| 1958 | The Man Inside | Organ Grinder |
| 1958 | Guillaume Tell | |
| 1958 | Heart of a Child | Spiel |
| 1958 | The Greatest Man in the World | US President |
| 1957 | Il était un petit navire | Cashier |
| 1957 | The Man in the Sky | Crabtree |
| 1957 | Manuela | Evans |
| 1956 | 1984 | R. Parsons |
| 1956 | Tony Awards | Self - Nominee |
| 1956 | Le secret des tentes noires | Ali |
| 1956 | Armchair Theatre | President of the USA |
| 1955 | Les Aventures de Robin Des Bois | Prince John |
| 1955 | Value for Money | Limpy |
| 1955 | Round the World in 80 Days | Voices |
| 1954 | Nineteen Eighty-Four | Syme |
| 1954 | Le Monde Merveilleux De Disney En Couleurs | Captain Pinski |
| 1954 | Orders Are Orders | Cpl. Martin (as Donald Plesance) |
| 1954 | The Beachcomber | Tromp |
| 1952 | The Dybbuk | Second batlon |
| 1951 | Hallmark Hall of Fame | Kantorek |
| 1951 | Hallmark Hall of Fame | Myers |
| 1951 | Hallmark Hall of Fame | The Chancellor |
| 1950 | Sunday Night Theatre | Syme |
