| 2011 | Stonerville | Producer |
| 2009 | Stan Helsing | Kay |
| 2008 | An American Carol | Osama Bin Nielsen / Grandpa |
| 2008 | Superhero Movie | Uncle Albert Adams |
| 2006 | Amazing! Exploring the Far Reaches of Forbidden Planet | Self |
| 2006 | Scary Movie 4 | President Baxter Harris |
| 2005 | Robson Arms (serie) | Caldo Vasco |
| 2004 | The Nutcracker and the Mouseking | (Mouseking) (voice) |
| 2004 | Zeroman (serie) | Zeroman (voice) |
| 2003 | Noël Noël | Narrator (english version) |
| 2003 | Scary Movie 3 | President Baxter Harris |
| 2003 | Chilly Beach (serie) | — |
| 2003 | Odd Job Jack (serie) | — |
| 2001 | Camuflaje | Jack Potter |
| 2001 | Esquía como puedas | Clive Thorton / Cab Driver |
| 2000 | Milagro en Navidad | Santa Claus |
| 2000 | 2001: Despega como puedas | Richard 'Dick' Dix |
| 1999 | Pirates: 3D Show | Lucky |
| 1999 | Harvey (serie) | Dr. Chumley |
| 1999 | The Late Late Show with Craig Kilborn (serie) | Self |
| 1999 | Padre de familia (serie) | Dr. Rumack (archive footage) |
| 1998 | ¡Vaya un fugitivo! | Ryan Harrison |
| 1997 | Mr. Magoo | Mr. Quincy Magoo |
| 1997 | The Wonderful World of Disney (serie) | Mr. Penn |
| 1997 | Leslie Nielsen's Stupid Little Golf Video | Himself |
| 1997 | Acampa como puedas | Harry Haber |
| 1996 | The Rosie O'Donnell Show (serie) | Self |
| 1996 | Espía como puedas | Dick Steele |
| 1995 | Drácula, un muerto muy contento y feliz | Count Dracula |
| 1995 | El árbol de Navidad del señor Willowby | Willowby's butler |
| 1995 | Die Harald Schmidt Show (serie) | Self |
| 1995 | Familia de alquiler | Harry Haber |
| 1994 | Golfos de broma | Lucio Cinico |
| 1994 | An Audience with Jimmy Tarbuck | Self - Audience Member |
| 1994 | Due South (serie) | Sgt. Buck Frobisher |
| 1994 | Agárralo como puedas 33 1/3: el insulto final | Lt. Frank Drebin |
| 1994 | Leslie Nielsen's Bad Golf My Way | Leslie Nielsen |
| 1993 | Leslie Nielsen's Bad Golf Made Easier | Himself |
| 1993 | Digger | Arthur Evrensel |
| 1993 | Los hermanos Marx: el mundo insólito | Self - Narrator |
| 1993 | Surf Ninjas | Colonel Chi |
| 1993 | Katie and Orbie (serie) | Narrator |
| 1993 | Raw (serie) | Leslie Nielsen |
| 1992 | Terry Wogan's Friday Night (serie) | Self |
| 1991 | Chance of a Lifetime | Lloyd Dixon |
| 1991 | Herman's Head (serie) | God |
| 1991 | Agárralo como puedas 2 1/2: el aroma del miedo | Lt. Frank Drebin |
| 1990 | Evening Shade (serie) | — |
| 1990 | Reposeída | Father Jebedaiah Mayii |
| 1989 | Back to the Future (Part II): Behind-the-Scenes Special Presentation | Host |
| 1989 | The Railway Dragon | Narrator (voice) |
| 1988 | Agárralo como puedas | Frank Drebin |
| 1988 | Day by Day (serie) | — |
| 1987 | Fatal Confession: A Father Dowling Mystery | Senator Erdain |
| 1987 | Nightstick | Thad Evans |
| 1987 | Home Is Where the Hart Is | Sheriff Nashville Schwartz |
| 1986 | Harvard: movida americana | Mr. Dunbar |
| 1986 | The Patriot | Admiral Frazer |
| 1985 | Striker's Mountain | Jim McKay |
| 1985 | Las chicas de oro (serie) | Lucas |
| 1985 | 227 (serie) | — |
| 1985 | The Ray Bradbury Theater (serie) | Fantoccini |
| 1985 | Reckless Disregard | Bob Franklin |
| 1985 | Blade in Hong Kong | Harry Ingersoll |
| 1984 | Finder of Lost Loves (serie) | Matthew Vail |
| 1984 | ¿Quién es el jefe? (serie) | — |
| 1984 | Autopista hacia el cielo (serie) | — |
| 1983 | The Creature Wasn't Nice | Capt. Jamieson |
| 1983 | Cave-In! | Joe Johnson |
| 1983 | The Night the Bridge Fell Down | Paul Warren |
| 1982 | Creepshow | Richard Vickers (segment "Something To Tide You Over") |
| 1982 | Wogan (serie) | Self |
| 1982 | Police Squad! (serie) | Lt. Frank Drebin |
| 1982 | Rayo de amor | Reece Morgan |
| 1981 | Aloha Paradise (serie) | Grant Culberson |
| 1980 | Prom Night: Llamadas de terror | Mr. Hammond |
| 1980 | Aterriza como puedas | Dr. Rumack |
| 1980 | OHMS | Governor |
| 1979 | The Littlest Hobo (serie) | Mayor Chester Montgomery |
| 1979 | Ciudad en llamas | Mayor William Dudley |
| 1979 | The Chisholms (serie) | — |
| 1979 | Backstairs at the White House (serie) | Ike Hoover |
| 1977 | Organización Amsterdam | Riley Knight |
| 1977 | Vacaciones en el mar (serie) | Dan Michaels |
| 1977 | Lucan (serie) | — |
| 1977 | Viva Knievel! | Stanley Millard |
| 1977 | El día de los animales | Paul Jenson |
| 1977 | The Dawson Patrol | Narrator |
| 1977 | Grand Jury | John Williams |
| 1977 | Sixth and Main | John Doe |
| 1976 | Project: Kill | John Trevor |
| 1976 | Brinks: The Great Robbery | Agent Norman Houston |
| 1975 | Saturday Night Live (serie) | Self - Host |
| 1975 | The Outlaw Cats of Colossal Cave | Narrator |
| 1975 | Sidestreet (serie) | — |
| 1975 | The Swiss Family Robinson (serie) | — |
| 1975 | Los hombres de Harrelson (serie) | — |
| 1974 | The Manhunter (serie) | — |
| 1974 | Can Ellen Be Saved? | Arnold Lindsey |
| 1973 | The Evil Touch (serie) | — |
| 1973 | Amanda Fallon | Mr. Cummings |
| 1973 | The Letters | Derek Childs |
| 1973 | Barnaby Jones (serie) | Edward Brendon |
| 1973 | And Millions Die! | Jack Gallagher |
| 1973 | Journey to the Outer Limits | (voice) |
| 1972 | Assignment: Vienna (serie) | Floyd Macklin |
| 1972 | Las calles de San Francisco (serie) | — |
| 1972 | The Rookies (serie) | — |
| 1971 | La resurrección de Zacarías Wheeler | Harry Walsh |
| 1971 | Sarge (serie) | — |
| 1971 | Monty Nash (serie) | Ross Carter |
| 1971 | Bearcats! (serie) | Col. Ted Donovan |
| 1971 | Colombo (serie) | Peter Hamilton |
| 1971 | Cannon (serie) | Erich Strasser |
| 1971 | Incident in San Francisco | Lt. Brubaker |
| 1970 | Galería nocturna (Night Gallery) (serie) | The Phantom (segment "Phantom of What Opera?") |
| 1970 | Hauser's Memory | Joseph Slaughter |
| 1970 | The Aquarians | Official |
| 1970 | Night Slaves | Sheriff Henshaw |
| 1969 | Change of Mind | Sheriff Webb |
| 1969 | The Bold Ones: The Protectors (serie) | Deputy Police Chief Sam Danforth |
| 1969 | Bracken's World (serie) | — |
| 1969 | Los nuevos médicos (serie) | Mr. Cummings |
| 1969 | Como suicidarse en matrimonio | Phil Fletcher |
| 1969 | Deadlock | Lt. Sam Danforth |
| 1969 | Trial Run | Jason Harkness |
| 1969 | Cuatro cabalgaron | Mr Brown |
| 1968 | Companions in Nightmare | Dr. Neesden |
| 1968 | Dayton's Devils | Frank Dayton |
| 1968 | Patrulla juvenil (serie) | Rusty Bryson |
| 1968 | The Name of the Game (serie) | — |
| 1968 | Hawaii 5-0 (serie) | Brent |
| 1968 | El Agente de CIPOL: Como Robar el Mundo | General Maximilian Harmon |
| 1968 | The Wild Heart | Narrator |
| 1968 | Shadow Over Elveron | Sheriff Verne Drover |
| 1968 | Ladrón sin destino (serie) | S.I.A. Security Man |
| 1967 | Una tumba al amanecer | Victor Rice |
| 1967 | Judd for the Defense (serie) | — |
| 1967 | Cimarron (serie) | — |
| 1967 | The Reluctant Astronaut | Major Fred Gifford |
| 1967 | Ironside (serie) | — |
| 1967 | The Boy Who Flew with Condors | Narrator |
| 1967 | Justicia en Abilene | Grant Evers |
| 1967 | Code Name: Heraclitus | Fryer |
| 1966 | La fuerza de la nobleza | Col. George Armstrong Custer |
| 1965 | The F.B.I. (serie) | Hudson |
| 1965 | Jim West (serie) | Major General Ball |
| 1965 | The Big Valley (serie) | Sgt. Maj. Earl Conway |
| 1965 | National Geographic Specials (serie) | Narrator (voice) |
| 1965 | Dark Intruder | Brett Kingsford |
| 1964 | See How They Run | Elliot Green |
| 1964 | Daniel Boone (serie) | William Russell |
| 1964 | Night Train to Paris | Alan Holiday |
| 1964 | Viaje al fondo del mar (serie) | — |
| 1963 | Kraft Suspense Theatre (serie) | Dr. David Cord |
| 1963 | La hora de los famosos (serie) | — |
| 1963 | Channing (serie) | Prof. Paul Stafford |
| 1963 | El fugitivo (serie) | Martin C. Rowland |
| 1962 | La hora de Alfred Hitchcock (serie) | Mr. Grainger |
| 1961 | The New Breed (serie) | Lt. Price Adams |
| 1961 | Dr. Kildare (serie) | Harry Kleber |
| 1961 | Los defensores (serie) | Bob Garrison |
| 1960 | Route 66 (serie) | — |
| 1959 | The Swamp Fox (serie) | Francis Marion (The Swamp Fox) |
| 1959 | The Velvet Alley | Eddie Kirkley |
| 1959 | Rawhide (serie) | Eli Becker |
| 1958 | Naked City (serie) | Norman Garry |
| 1958 | Furia en el valle | Stephen Bedford / Johnny Bledsoe |
| 1957 | Wagon Train (serie) | Brian Conlin |
| 1957 | Tammy, la muchacha salvaje | Peter Brent |
| 1957 | Hot Summer Night | William Joel Partain |
| 1956 | El sexo opuesto | Steve Hilliard |
| 1956 | Playhouse 90 (serie) | Ralph Mohr |
| 1956 | El rey vagabundo | Thibault d'Aussigny |
| 1956 | Planeta prohibido | Commander John J. Adams |
| 1956 | Rapto | Charlie Telfer |
| 1955 | The Battle of Gettysburg | Narrator (voice) |
| 1955 | Alfred Hitchcock presenta (serie) | Lloyd Ashley |
| 1955 | Gunsmoke (serie) | Jess Trevor |
| 1954 | Dark Possession | Dr. Roger Waring |
| 1953 | General Electric Theater (serie) | Edward Morgan |
| 1951 | Hallmark Hall of Fame (serie) | — |
| 1951 | Goodyear Television Playhouse (serie) | — |
| 1951 | Tales of Tomorrow (serie) | — |
| 1950 | Danger (serie) | — |
| 1950 | The Bob Hope Show (serie) | Self |
| 1950 | Starlight Theatre (serie) | — |
| 1950 | Robert Montgomery Presents (serie) | Gates Holden |
| 1949 | Lights Out (serie) | — |
| 1949 | Suspense (serie) | — |
| 1948 | Studio One (serie) | — |
| 1944 | Premios Globo de Oro (serie) | Self - Host |
