| 2024 | El último taller de instrumentos | The Monster (archive footage) (uncredited) |
| 2022 | Boris Karloff: The Rest of the Story | Self - Interviewee |
| 2021 | Boris Karloff: The Man Behind the Monster | Self (archive footage) |
| 2015 | Jack Pierce: The Man Who Made the Monsters | Self (archive footage) |
| 2013 | A Masque of Madness (Notes on Film 06-B, Monologue 02) | Self (archive footage) |
| 2012 | The Complete Bob Wilkins Creature Features | — |
| 2007 | Le vampire déchu | Himself (archive footage) |
| 2007 | Ian Rankin Investigates: Dr. Jekyll & Mr. Hyde | Cabman John Gray (archive footage) |
| 2006 | Terror in the Tropics | Mr. Wong (archive footage) |
| 2005 | Bones (serie) | Imhotep (archive footage) (uncredited) |
| 2004 | Monster Movie Trivia Quiz | — |
| 2001 | Heroes of Horror | (archive footage) |
| 1996 | The Universal Story | Self (archive footage) |
| 1971 | Invasión Siniestra | Prof. John Mayer |
| 1971 | La muerte viviente | Carl van Molder / Damballah |
| 1970 | El coleccionista de cadáveres | Franz Badulescu |
| 1968 | La maldición del altar rojo | Professor John Marsh |
| 1968 | The Name of the Game (serie) | Mikhail Orlov |
| 1968 | El héroe anda suelto | Byron Orlok |
| 1968 | La Cámara del Terror | Dr. Carl Mandel |
| 1968 | Serenata Macabra | Matthias Morteval |
| 1967 | Los brujos | Prof. Marcus Monserrat |
| 1967 | Mad monster party? | Baron Boris von Frankenstein (voice) |
| 1967 | Intriga en Venecia | Dr. Pierre Vaugiroud |
| 1966 | El Grinch: el cuento animado | Narrator / The Grinch (voice) |
| 1966 | The Girl from U.N.C.L.E. (serie) | — |
| 1966 | Doom of Dracula | The Madman |
| 1965 | El monstruo del terror | Nahum Witley |
| 1965 | Jim West (serie) | Mr. Singh |
| 1964 | Shindig! (serie) | Self - Guest Host / Singer |
| 1964 | Today's Teens | Narrator |
| 1964 | La comedia de los horrores | Amos Hinchley |
| 1964 | Mondo Balordo | Narrator |
| 1963 | Las tres caras del miedo | Gorca (segment "The Wurdalak") |
| 1963 | El terror | Baron Victor Frederick Von Leppe |
| 1963 | El cuervo | Dr. Scarabus |
| 1962 | Little Lost Robot | Host |
| 1962 | The Incredible Doktor Markesan | Dr. Konrad Markesan |
| 1962 | Arsenic & Old Lace | Jonathan Brewster |
| 1961 | The Return of Andrew Bentley | Host |
| 1960 | The Fatal Impulse | Self |
| 1960 | Route 66 (serie) | — |
| 1960 | Thriller (serie) | Self - Host |
| 1958 | Pasillos de sangre | Dr. Thomas Bolton |
| 1958 | Heart of Darkness | Mr. Kurtz |
| 1958 | Frankenstein 1970 | Baron Viktor von Frankenstein |
| 1958 | El estrangulador fantasma | James Rankin |
| 1958 | Destination Nightmare | Host / Ira Perry / Pete Wade Sr. / Professor Charles Goncourt / Morgan Debs |
| 1958 | Jack the Ripper | Host / Capt. John Elwood / Jonas Atterbury / Dr. Francis Mason |
| 1958 | Shirley Temple's Storybook (serie) | Narrator (voice) / Father Knickerbocker |
| 1958 | El velo (serie) | — |
| 1957 | The Juggler of Our Lady | Narrator (voice) |
| 1957 | Las cuatro en punto (serie) | Judge Winthrop Gelsey |
| 1957 | DuPont Show of the Month (serie) | — |
| 1957 | The Lark | Bishop Cauchon |
| 1957 | Voodoo Island | Phillip Knight |
| 1956 | Telephone Time (serie) | — |
| 1956 | Colonel March of Scotland Yard (serie) | Colonel March Of Scotland Yard |
| 1955 | This Is Your Life (serie) | Self |
| 1955 | A Connecticut Yankee | King Arthur |
| 1955 | The Sting of Death | Mr. Mycroft |
| 1955 | Sabaka | General Pollegar |
| 1954 | Climax! (serie) | Vicar Tellworth |
| 1954 | The George Gobel Show (serie) | Self |
| 1954 | Il mostro dell'isola | Don Gaetano |
| 1953 | Abbott y Costello contra el Dr. Jekyll y Mr. Hyde | Dr. Henry Jekyll / Mr. Hyde |
| 1953 | Colonel March Investigates | Colonel March |
| 1953 | General Electric Theater (serie) | Henry E. Church |
| 1952 | El castillo del ogro | Dr. Meissen |
| 1951 | Hallmark Hall of Fame (serie) | Jonathan Brewster |
| 1951 | Schlitz Playhouse of Stars (serie) | Charles Brandon |
| 1951 | The Red Skelton Show (serie) | Professor Townsend (Spy) |
| 1951 | Tales of Tomorrow (serie) | — |
| 1951 | The Strange Door | Voltan |
| 1950 | Lux Video Theatre (serie) | Larkin |
| 1950 | What's My Line? (serie) | Self |
| 1950 | Robert Montgomery Presents (serie) | — |
| 1949 | Abbott y Costello Contra el Asesino | Swami Talpur |
| 1949 | Lights Out (serie) | — |
| 1949 | El emperador y el ruiseñor | Narrator (English version) |
| 1949 | Suspense (serie) | — |
| 1948 | Studio One (serie) | Professor Koernig |
| 1948 | Raíces de pasión | Tishomingo |
| 1947 | Los inconquistables | Guyasuta, Chief of the Senecas |
| 1947 | Dick Tracy Meets Gruesome | Gruesome |
| 1947 | El asesino poeta | Charles van Druten |
| 1946 | Bedlam, hospital psiquiátrico | George Sims |
| 1945 | La isla de la muerte | Gen. Nikolas Pherides |
| 1945 | El ladrón de cadáveres | John Gray |
| 1944 | La zíngara y los monstruos (La mansión de Frankenstein) | Dr. Gustav Niemann |
| 1944 | Misterio en la ópera | Dr. Friedrich Hohner |
| 1942 | The Boogie Man Will Get You | Prof. Nathaniel Billings |
| 1942 | Hedda Hopper’s Hollywood No. 6 | Himself |
| 1941 | Information Please: Series 2, No. 12 | Self |
| 1941 | The Devil Commands | Dr. Julian Blair |
| 1940 | El castillo de los misterios | Judge Spencer Mainwaring |
| 1940 | The Ape | Dr. Bernard Adrian |
| 1940 | El mago de la muerte | Dr. John Garth |
| 1940 | Sentenciado a muerte | James Lee Wong |
| 1940 | The Man with Nine Lives | Dr. Leon Kravaal |
| 1940 | The Fatal Hour | James Lee Wong |
| 1939 | La torre de Londres | Mord |
| 1939 | British Intelligence | Valdar |
| 1939 | La horca fatal | Dr. Henryk Savaard |
| 1939 | Mr. Wong in Chinatown | Mr. James Lee Wong |
| 1939 | El misterio de Mr. Wong | James Lee Wong |
| 1939 | El hijo de Frankenstein | The Monster |
| 1939 | Devil's Island | Dr. Charles Gaudet |
| 1938 | Mr. Wong, Detective | James Lee Wong |
| 1938 | The Invisible Menace | Jevries |
| 1937 | West of Shanghai | "General" Wu Yen Fang |
| 1937 | Night Key | David Mallory |
| 1936 | Charlie Chan at the Opera | Gravelle |
| 1936 | El hombre que trocó su mente | Dr. Laurience |
| 1936 | Los muertos andan | John Ellman |
| 1935 | Horror en el cuarto negro | Baron Gregor de Berghman / Anton de Berghman |
| 1935 | La novia de Frankenstein | The Monster |
| 1934 | Gift of Gab | Himself |
| 1934 | Satanás | Hjalmar Poelzig |
| 1934 | The House of Rothschild | Count Ledrantz |
| 1934 | La patrulla perdida | Sanders |
| 1934 | Screen Snapshots No. 11 | Himself |
| 1933 | El resucitado | Prof. Morlant |
| 1932 | La máscara de Fu Manchú | Dr. Fu Manchu |
| 1932 | El caserón de las sombras | Morgan |
| 1932 | Night World | 'Happy' MacDonald |
| 1932 | The Cohens and Kellys in Hollywood | Boris Karloff |
| 1932 | Behind the Mask | Jim Henderson |
| 1931 | El doctor Frankenstein | The Monster |
| 1931 | The Guilty Generation | Tony Ricca |
| 1931 | Graft | Terry |
| 1931 | I Like Your Nerve | Luigi - Pacheco's Butler |
| 1931 | The Public Defender | The Professor |
| 1931 | Young Donovan's Kid | Cokey Joe |
| 1931 | Cracked Nuts | Boris - First Revolutionary |
| 1931 | King of the Wild | Mustapha |
| 1931 | Esta noche o nunca | Waiter |
| 1931 | El código criminal | Ned Galloway |
| 1930 | The Utah Kid | Henchman Baxter |
| 1930 | The Sea Bat | Corsican |
| 1929 | The King of the Kongo | Scarface Macklin |
| 1929 | Behind That Curtain | Beetham's Manservent |
| 1929 | The Phantom of the North | Jules Gregg |
| 1929 | Two Sisters | Cecil |
| 1929 | The Devil's Chaplain | Boris |
| 1929 | The Fatal Warning | Mullins |
| 1929 | Burning the Wind | Pug Doran |
| 1928 | The Little Wild Girl | Maurice Kent |
| 1928 | Vultures of the Sea | Grouchy |
| 1928 | The Vanishing Rider | The Villain |
| 1927 | The Love Mart | Fleming |
| 1927 | Hermanos de armas | Purser |
| 1927 | The Phantom Buster | Ramon |
| 1927 | The Meddlin' Stranger | Al Meggs |
| 1927 | Tarzan and the Golden Lion | Owaza |
| 1926 | Flaming Fury | Gaspard |
| 1926 | The Nickel-Hopper | Dance Hall Masher |
| 1926 | Flames | Blackie Blanchette |
| 1926 | The Golden Web | Dave Sinclair |
| 1926 | The Bells | The Mesmerist |
| 1926 | Her Honor, the Governor | Snipe Collins |
| 1925 | Parisian Nights | Pierre |
| 1925 | Lady Robinhood | Cabraza |
| 1925 | The Prairie Wife | Diego |
| 1924 | Dynamite Dan | Tony Garcia |
| 1924 | The Hellion | The Outlaw |
| 1924 | The White Panther | Shere Ali's Aide (as Karloff Boris) |
| 1922 | The Altar Stairs | Hugo |
| 1922 | The Woman Conquers | Raoul Maris |
| 1922 | The Infidel | The Nabob |
| 1922 | The Man from Downing Street | Maharajah Jehan |
| 1921 | The Cave Girl | Baptiste |
| 1921 | Without Benefit of Clergy | Ahmed Khan |
| 1921 | The Hope Diamond Mystery | Priest of Kama-Sita / Dakar |
| 1920 | The Courage of Marge O'Doone | Tavish |
| 1920 | The Deadlier Sex | Jules Borney |
| 1919 | The Lightning Raider | — |
