| 2026 | The Orbit of Minor Satellites | Roger Ashley Norton |
| 2025 | Legacy of Screams: The Evolution of Horror Movies | Self (archive footage) |
| 2024 | The Last Repair Shop | 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) |
| 2021 | Hollywood in the Atomic Age: Monsters! Martians! Mad Scientists! | Self (archive footage) |
| 2015 | True Fear: The Making of Psycho | Self |
| 2015 | Jack Pierce: The Man Who Made the Monsters | Self (archive footage) |
| 2014 | Monster Madness: The Golden Age of the Horror Film | Various roles (archive footage) |
| 2013 | A Masque of Madness (Notes on Film 06-B, Monologue 02) | Self (archive footage) |
| 2013 | Classic Movie Bloopers: Uncensored | Self (archive footage) |
| 2012 | The Complete Bob Wilkins Creature Features | |
| 2008 | He Who Made Monsters: The Life and Art of Jack Pierce | Self (archive footage) |
| 2007 | Bela Lugosi: The Fallen Vampire | Himself (archive footage) |
| 2007 | Ian Rankin Investigates: Dr. Jekyll & Mr. Hyde | Cabman John Gray (archive footage) |
| 2007 | Famous Monster: Forrest J Ackerman | Self (archive footage) |
| 2006 | Lugosi: The Dark Prince | Self (archive footage) |
| 2006 | Karloff: The Gentle Monster | Self (archive footage) |
| 2006 | Terror in the Tropics | Mr. Wong (archive footage) |
| 2004 | Monster Movie Trivia Quiz | |
| 2003 | The Mesmerist | (archive footage) |
| 2001 | Heroes of Horror | (archive footage) |
| 2000 | The American Nightmare | Self |
| 2000 | Mummy Dearest: A Horror Tradition Unearthed | Self (archive footage) |
| 2000 | The Many Faces of Dracula | The Monster (archive footage) |
| 1999 | The 'Frankenstein' Files: How Hollywood Made a Monster | Self (archive footage) |
| 1999 | Monster by Moonlight! The Immortal Saga of 'The Wolf Man' | Self (archive footage) |
| 1998 | Universal Horror | (archive footage) |
| 1996 | The Universal Story | Self (archive footage) |
| 1994 | Abbott and Costello Meet Jerry Seinfeld | Self (archive footage) |
| 1994 | How the Grinch Stole Christmas! Special Edition | (voice - archive footage) |
| 1992 | Dracula in the Movies | (archive footage) |
| 1991 | Halloween Monster Bash | Baron Von Leppe (archive footage) |
| 1991 | Dracula: A Cinematic Scrapbook | Doctor Gustav Niemann (archive footage) |
| 1991 | Frankenstein: A Cinematic Scrapbook | The Monster / Gustav Niemann / Dr. Jekyll / Mr. Hyde / etc. |
| 1990 | Myrna Loy: So Nice to Come Home To | (archive footage) |
| 1990 | Abbott and Costello in the Movies | Archival |
| 1989 | Transylvania Twist | Man in Room (archive footage) |
| 1988 | Hollywood Scandals and Tragedies | (archive footage) (uncredited) |
| 1987 | Creepy Classics | Dr. Scarabus - (archive footage) |
| 1985 | Don't Scream: It's Only a Movie! | Self |
| 1984 | Going Hollywood: The '30s | (archive footage) |
| 1983 | The Horror of It All | Frankenstein / Cabman John Gray (archive footage) |
| 1982 | Oops, Those Hollywood Bloopers! | Self (archive footage) |
| 1980 | Monsters on the March (and a Pair of Marvels!) | |
| 1979 | The Horror Show | (archive footage) |
| 1975 | Brother, Can You Spare a Dime? | Self (archive footage) |
| 1974 | Madhouse | (archive footage) |
| 1974 | The Horror Hall of Fame: A Monster Salute | Self (archive footage) |
| 1971 | Alien Terror | Prof. John Mayer |
| 1971 | Isle of the Snake People | Carl van Molder / Damballah |
| 1970 | Hatchet for the Honeymoon | Gorca (archive footage) |
| 1968 | Curse of the Crimson Altar | Professor John Marsh |
| 1968 | Targets | Byron Orlok |
| 1968 | Fear Chamber | Dr. Carl Mandel |
| 1968 | Macabre Serenade | Matthias Morteval |
| 1968 | Cauldron of Blood | Franz Badulescu |
| 1968 | The Movie Orgy | Self (archive footage) |
| 1967 | The Sorcerers | Prof. Marcus Monserrat |
| 1967 | Mad Monster Party? | Baron Boris von Frankenstein (voice) |
| 1966 | How the Grinch Stole Christmas! | Narrator / The Grinch (voice) |
| 1966 | The Venetian Affair | Dr. Pierre Vaugiroud |
| 1966 | The Daydreamer | The Rat (voice) |
| 1966 | The Ghost in the Invisible Bikini | The Corpse |
| 1965 | Die, Monster, Die! | Nahum Witley |
| 1964 | Bikini Beach | Art Dealer |
| 1964 | Today's Teens | Narrator |
| 1964 | The Comedy of Terrors | Amos Hinchley |
| 1964 | Horror!!! | Self |
| 1964 | A Fool's World | Narrator |
| 1963 | Black Sabbath | Gorca (segment "The Wurdalak") |
| 1963 | The Terror | Baron Victor Frederick Von Leppe |
| 1963 | The Raven | Dr. Scarabus |
| 1962 | Lizard's Leg and Owlet's Wing | |
| 1962 | Little Lost Robot | Host |
| 1962 | The Incredible Doktor Markesan | Dr. Konrad Markesan |
| 1962 | Arsenic & Old Lace | Jonathan Brewster |
| 1962 | The Storm | |
| 1961 | The Grim Reaper | Self |
| 1961 | Days of Thrills and Laughter | Self (archive footage) |
| 1960 | Who Killed Chung Ling Soo? | Narrator |
| 1960 | The Fatal Impulse | Self |
| 1958 | Corridors of Blood | Dr. Thomas Bolton |
| 1958 | Heart of Darkness | Mr. Kurtz |
| 1958 | Frankenstein 1970 | Baron Viktor von Frankenstein |
| 1958 | Grip of the Strangler | James Rankin |
| 1958 | Jack the Ripper | Host / Capt. John Elwood / Jonas Atterbury / Dr. Francis Mason |
| 1958 | Destination Nightmare | Host / Ira Perry / Pete Wade Sr. / Professor Charles Goncourt / Morgan Debs |
| 1957 | The Juggler of Our Lady | Narrator (voice) |
| 1957 | The Lark | Bishop Cauchon |
| 1957 | Voodoo Island | Phillip Knight |
| 1956 | Rendezvous in Black | Ward Allen |
| 1955 | A Connecticut Yankee | King Arthur |
| 1955 | Sting of Death | Mr. Mycroft |
| 1955 | Sabaka | General Pollegar |
| 1954 | The Island Monster | Don Gaetano |
| 1953 | Abbott and Costello Meet Dr. Jekyll and Mr. Hyde | Dr. Henry Jekyll / Mr. Hyde |
| 1953 | Colonel March Investigates | Colonel March |
| 1952 | The Black Castle | Dr. Meissen |
| 1951 | The Strange Door | Voltan |
| 1949 | Bud Abbott and Lou Costello Meet the Killer, Boris Karloff | Swami Talpur |
| 1948 | Tap Roots | Tishomingo |
| 1947 | Unconquered | Guyasuta, Chief of the Senecas |
| 1947 | Dick Tracy Meets Gruesome | Gruesome |
| 1947 | The Secret Life of Walter Mitty | Dr. Hollingshead |
| 1947 | Lured | Charles van Druten |
| 1946 | Bedlam | George Sims |
| 1945 | Isle of the Dead | Gen. Nikolas Pherides |
| 1945 | The Body Snatcher | John Gray |
| 1944 | The Mummy's Curse | Kharis in Flashback (archive footage / uncredited) |
| 1944 | House of Frankenstein | Dr. Gustav Niemann |
| 1944 | The Climax | Dr. Friedrich Hohner |
| 1942 | The Boogie Man Will Get You | Prof. Nathaniel Billings |
| 1942 | Hedda Hopper’s Hollywood No. 6 | Self |
| 1941 | The Devil Commands | Dr. Julian Blair |
| 1941 | Information Please: Series 2, No. 12 | Self |
| 1940 | You'll Find Out | Judge Spencer Mainwaring |
| 1940 | The Ape | Dr. Bernard Adrian |
| 1940 | The Mummy's Hand | Kharis (archive footage / uncredited) |
| 1940 | Before I Hang | Dr. John Garth |
| 1940 | Doomed to Die | James Lee Wong |
| 1940 | The Man with Nine Lives | Dr. Leon Kravaal |
| 1940 | Black Friday | Dr. Ernest Sovac |
| 1940 | The Fatal Hour | James Lee Wong |
| 1939 | Tower of London | Mord |
| 1939 | British Intelligence | Valdar |
| 1939 | The Man They Could Not Hang | Dr. Henryk Savaard |
| 1939 | Mr. Wong in Chinatown | Mr. James Lee Wong |
| 1939 | The Mystery of Mr. Wong | James Lee Wong |
| 1939 | Son of Frankenstein | The Monster |
| 1939 | Devil's Island | Dr. Charles Gaudet |
| 1938 | Mr. Wong, Detective | James Lee Wong |
| 1938 | The Invisible Menace | Jevries |
| 1937 | Breakdowns of 1937 | Self |
| 1937 | West of Shanghai | "General" Wu Yen Fang |
| 1937 | Night Key | David Mallory |
| 1937 | Cinema Circus | Himself |
| 1936 | Charlie Chan at the Opera | Gravelle |
| 1936 | The Man Who Changed His Mind | Dr. Laurence |
| 1936 | Juggernaut | Dr. Victor Sartorius |
| 1936 | The Walking Dead | John Ellman |
| 1936 | The Invisible Ray | Dr. Janos Rukh |
| 1935 | The Black Room | Baron Gregor de Berghman / Anton de Berghman |
| 1935 | The Raven | Edmond Bateman |
| 1935 | Hollywood Hobbies | Himself |
| 1935 | Bride of Frankenstein | The Monster |
| 1934 | Gift of Gab | Himself |
| 1934 | The Black Cat | Hjalmar Poelzig |
| 1934 | The House of Rothschild | Count Ledrantz |
| 1934 | The Lost Patrol | Sanders |
| 1934 | Screen Snapshots No. 11 | Himself |
| 1933 | The Ghoul | Prof. Morlant |
| 1932 | The Mummy | Imhotep / Ardath Bey |
| 1932 | Boo | Frankenstein's Monster (edited from "Frankenstein") |
| 1932 | The Mask of Fu Manchu | Dr. Fu Manchu |
| 1932 | The Old Dark House | Morgan |
| 1932 | Skyscraper Souls | Man Approaching Ticket Counter |
| 1932 | Night World | 'Happy' MacDonald |
| 1932 | Scarface | Gaffney |
| 1932 | The Miracle Man | Nikko |
| 1932 | The Cohens and Kellys in Hollywood | Boris Karloff |
| 1932 | Behind the Mask | Jim Henderson |
| 1932 | Business and Pleasure | Sheik Ali-Ben Joseph |
| 1931 | Frankenstein | The Monster |
| 1931 | The Guilty Generation | Tony Ricca |
| 1931 | The Yellow Ticket | Drunken Orderly |
| 1931 | The Mad Genius | Fedor's Father (uncredited) |
| 1931 | Five Star Final | T. Vernon Isopod |
| 1931 | Graft | Terry |
| 1931 | I Like Your Nerve | Luigi - Pacheco's Butler |
| 1931 | The Public Defender | The Professor |
| 1931 | Smart Money | Sport Williams |
| 1931 | Young Donovan's Kid | Cokey Joe |
| 1931 | The Vanishing Legion | The Voice (voice) |
| 1931 | Cracked Nuts | Boris - First Revolutionary |
| 1931 | King of the Wild | Mustapha |
| 1931 | Tonight or Never | Waiter |
| 1931 | The Criminal Code | Ned Galloway |
| 1930 | The Utah Kid | Henchman Baxter |
| 1930 | The Sea Bat | Corsican |
| 1930 | The Bad One | Monsieur Gaston |
| 1929 | The Unholy Night | Abdul Mohammed Bey - the Hindu Lawyer (uncredited) |
| 1929 | The King of the Kongo | Scarface Macklin |
| 1929 | Behind That Curtain | Beetham's Manservent |
| 1929 | The Phantom of the North | Jules Gregg |
| 1929 | Anne Against the World | |
| 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 |
| 1928 | Sharp Shooters | Cafe Proprietor (uncredited) |
| 1927 | The Love Mart | Fleming |
| 1927 | Two Arabian Knights | Purser |
| 1927 | Soft Cushions | The Chief Conspirator |
| 1927 | The Phantom Buster | Ramon |
| 1927 | The Meddlin' Stranger | Al Meggs |
| 1927 | Tarzan and the Golden Lion | Owaza |
| 1927 | The Princess from Hoboken | Pavel |
| 1927 | Let It Rain | Crook |
| 1926 | Old Ironsides | Saracen Guard (uncredited) |
| 1926 | Flaming Fury | Gaspard |
| 1926 | The Nickel-Hopper | Dance Hall Masher |
| 1926 | The Eagle of the Sea | Pirate (uncredited) |
| 1926 | Flames | Blackie Blanchette |
| 1926 | The Golden Web | Dave Sinclair |
| 1926 | The Bells | The Mesmerist |
| 1926 | Her Honor, the Governor | Snipe Collins |
| 1926 | The Man in the Saddle | Robber (uncredited) |
| 1926 | The Greater Glory | Scissors Grinder |
| 1925 | Without Mercy | Madame Gordon's 2nd Henchman (uncredited) |
| 1925 | Parisian Nights | Pierre |
| 1925 | Never the Twain Shall Meet | |
| 1925 | Perils of the Wild | |
| 1925 | Lady Robinhood | Cabraza |
| 1925 | The Prairie Wife | Diego |
| 1925 | Forbidden Cargo | Pietro Castillano |
| 1924 | Dynamite Dan | Tony Garcia |
| 1924 | Riders of the Plains | |
| 1924 | The Hellion | The Outlaw |
| 1924 | The White Panther | Shere Ali's Aide (as Karloff Boris) |
| 1923 | The Prisoner | Prince Kapolski |
| 1922 | Omar the Tentmaker | Imam Mowaffak |
| 1922 | The Altar Stairs | Hugo |
| 1922 | The Woman Conquers | Raoul Maris |
| 1922 | The Man from Downing Street | Maharajah Jehan |
| 1922 | The Infidel | The Nabob |
| 1922 | Nan of the North | Undetermined Role (uncredited) |
| 1921 | The Cave Girl | Baptiste |
| 1921 | Cheated Hearts | Nei Hamid |
| 1921 | Without Benefit of Clergy | Ahmed Khan |
| 1921 | The Hope Diamond Mystery | Priest of Kama-Sita / Dakar |
| 1920 | The Last of the Mohicans | Indian (uncredited) |
| 1920 | The Courage of Marge O'Doone | Tavish |
| 1920 | The Woman and the Puppet | (uncredited) |
| 1920 | The Deadlier Sex | Jules Borney |
| 1919 | The Prince and Betty | Undetermined Role |
| 1919 | His Majesty, the American | Henchman in cloth cap |
| 1919 | The Lightning Raider | |
