| Movie | 1959 | North by Northwest | Leonard | |
| Movie | 1993 | Sliver | Alex Parsons | |
| Movie | 2010 | Teenage Paparazzo | Self | |
| Movie | 1994 | Ed Wood | Bela Lugosi | |
| Movie | 1998 | Rounders | Abe Petrovsky | |
| Movie | 1998 | The X-Files | Kurtzweil | |
| Movie | 1995 | Joseph | Jakob | |
| Movie | 1965 | The Greatest Story Ever Told | Caiaphas | |
| Movie | 2004 | The Aryan Couple | Joseph Krauzenberg | |
| Movie | 1990 | By Dawn's Early Light | President | |
| Movie | 2001 | The Majestic | Harry Trimble | |
| Movie | 2000 | Ready to Rumble | Sal Bandini | |
| Movie | 1966 | Nevada Smith | Jesse Coe | |
| Movie | 1999 | EDtv | Al | |
| Movie | 1989 | Crimes and Misdemeanors | Judah Rosenthal | |
| Movie | 1965 | The Hallelujah Trail | Chief Walks-Stooped-Over | |
| Movie | 1963 | Cleopatra | Rufio | |
| Movie | 2009 | 9 | #2 (voice) | |
| Movie | 1963 | Decision at Midnight | | |
| Movie | 2005 | Steve McQueen: The Essence of Cool | Self | |
| Movie | 1970 | They Call Me Mister Tibbs! | Logan Sharpe | |
| Movie | 1988 | Tucker: The Man and His Dream | Abe | |
| Movie | 2008 | City of Ember | Sul | |
| Movie | 1979 | Meteor | General Adlon | |
| Movie | 2000 | Shiner | Frank Spedding | |
| Movie | 1991 | Firehead | Adm. Pendleton | |
| Movie | 2012 | Frankenweenie | Mr. Rzykruski (voice) | |
| Movie | 1980 | Without Warning | Fred 'Sarge' Dobbs | |
| Movie | 1987 | Empire State | Chuck | |
| Movie | 1994 | Intersection | Neal | |
| Movie | 1997 | B.A.P.S | Mr. Donald Blakemore | |
| Movie | 1971 | A Town Called Hell | The Colonel | |
| Movie | 1986 | Kung Fu: The Movie | John Martin Perkins III | |
| Movie | 1993 | 12:01 | Dr. Thadius Moxley | |
| Movie | 1996 | The Adventures of Pinocchio | Geppetto | |
| Movie | 2011 | Woody Allen: A Documentary | Self | |
| Movie | 2009 | Lovely, Still | Robert | |
| Movie | 2013 | Meir's Festival | Self | |
| Movie | 1992 | Mistress | Jack Roth | |
| Movie | 1987 | Cyclone | Bosarian | |
| Movie | 2002 | Shanghai Ghetto | Narrator | |
| Movie | 1983 | The Being | Garson Jones | |
| Movie | 1976 | Shadows in an Empty Room | Dr. George Tracer | |
| Movie | 1992 | No Place to Hide | Frank McCoy | |
| Movie | 1980 | Alien Attack | Commander John Koenig | |
| Movie | 1978 | Destination Moonbase-Alpha | Commander John Koenig | |
| Movie | 2011 | Mysteria | Hotel Manager | |
| Movie | 1982 | Journey Through the Black Sun | Commander John Koenig | |
| Movie | 1972 | Black Gunn | Capelli | |
| Movie | 2011 | Have a Little Faith | Rabbi Albert Lewis | |
| Movie | 2003 | Broadway: The Golden Age, by the Legends Who Were There | Self | |
| Movie | 1982 | Cosmic Princess | Commander John Koenig | |
| Movie | 1990 | Paint It Black | Daniel Lambert | |
| Movie | 1999 | Carlo's Wake | Carlo Torello | |
| Movie | 1987 | Sweet Revenge | Cicero | |
| Movie | 1980 | The Return | Niles Buchanan | |
| Movie | 1973 | Savage | Paul Savage | |
| Movie | 2001 | Cleopatra: The Film That Changed Hollywood | Self | |
| Movie | 1999 | The Joyriders | Gordon Trout | |
| Movie | 1997 | The Long Way Home | (voice) | |
| Movie | 2022 | Without Ward | | |
| Movie | 2001 | Haven | Papa Gruber | |
| Movie | 1999 | Sleepy Hollow | Peter Van Garrett (uncredited) | |
| Movie | 1962 | Stagecoach to Dancers' Rock | Dade Coleman | |
| Movie | 1988 | Run If You Can | Malvani | |
| Movie | 2013 | Anna Nicole | J. Howard Marshall | |
| Movie | 1988 | Real Bullets | Sallini | |
| Movie | 1989 | The Neon Empire | Max | |
| Movie | 2003 | Wake | Older Sebastian Riven | |
| Movie | 1999 | The New Adventures of Pinocchio | Geppetto | |
| Movie | 2016 | A Fighting Chance | Martin Kramer | |
| Movie | 1979 | The Death of Ocean View Park | Tom Flood | |
| Movie | 2004 | Cary Grant: A Class Apart | Self | |
| Movie | 1984 | Access Code | Agency Head | |
| Movie | 1960 | The Gazebo | The Duke | |
| Movie | 1993 | Eye of the Stranger | Mayor Howard Bains | |
| Movie | 2014 | Outlaw Prophet: Warren Jeffs | Rulon Jeffs | |
| Movie | 1970 | Operation Snafu | Joe Mellone | |
| Movie | 1999 | Bonanno: A Godfather's Story | Joseph Bonanno, age 94 | |
| Movie | 2015 | Entourage | Bob Ryan | |
| Movie | 1992 | Legacy of Lies | | |
| Movie | 1997 | Merry Christmas, George Bailey! | Pa Bailey / Mr. Potter | |
| Movie | 2015 | Remember | Max Rosenbaum | |
| Movie | 2010 | Ivory | Leon Spencer | |
| Movie | 1972 | Welcome Home, Johnny Bristol | Johnny Bristol | |
| Movie | 1996 | City Hall | Judge Walter Stern | |
| Movie | 1986 | Treasure Island | The Captain | |
| Movie | 2000 | Destination Hitchcock: The Making of 'North by Northwest' | Self | |
| Movie | 2008 | Billy: The Early Years | Old Charles Templeton | |
| Movie | 2008 | David & Fatima | Rabbi Schmulic | |
| Movie | 2003 | Hollywood Homicide | Jerry Duran | |
| Movie | 2005 | James Dean: Sense Memories | Self | |
| Movie | 1987 | W.A.R.: Women Against Rape | Judge Shaw | |
| Movie | 1981 | The Harlem Globetrotters on Gilligan's Island | J.J. Pierson | |
| Movie | 1998 | The Elevator | Roy Tilden | |
| Movie | 1991 | Secrets of the Unknown | Narrator | |
| Movie | 1979 | The Fall of the House of Usher | Roderick Usher | |
| Movie | 2007 | Brando | Self | |
| Movie | 1959 | Pork Chop Hill | Lt. Marshall | |
| Movie | 1979 | The Last Word | Captain Garrity | |
| Movie | 1998 | Off the Menu: The Last Days of Chasen's | Self | |
| Movie | 1991 | Echoes That Remain | Narrator (voice) | |
| Movie | 2000 | Very Mean Men | Mr. White | |
| Movie | 1997 | Legend of the Spirit Dog | Storyteller | |
| Movie | 2018 | Abe & Phil's Last Poker Game | Abe | |
| Movie | 1977 | Aliens from Spaceship Earth | Self | |
| Movie | 2008 | Harrison Montgomery | Harrison Montgomery | |
| Movie | 2017 | The Red Maple Leaf | Bernard Florence | |
| Movie | 2001 | Contender: Mastering the Method | Self | |
| Movie | 1992 | Something to Live for: The Alison Gertz Story | Jerry Gertz | |
| Movie | 2001 | Playboy Mansion Parties Uncensored | Self | |
| Movie | 1983 | Trial by Terror | | |
| Movie | 1969 | The Mama Cass Television Program | Self | |
| Movie | 1964 | The Ghost of Sierra de Cobre | Nelson Orion | |
| Movie | 1975 | Space 1999 | John Koenig | |
| Movie | 2009 | A Night at the Movies: The Gigantic World of Epics | Self | |
| Movie | 2009 | A Night at the Movies: The Suspenseful World of Thrillers | Self | |
| Movie | 2019 | Love, Antosha | Self (archive footage) | |
| Movie | 2005 | Hollywood's Greatest Villains | Self | |
| Movie | 1990 | The Color of Evening | Max Loeb | |
| Movie | 1987 | The Return of the Six-Million-Dollar Man and the Bionic Woman | Lyle Stenning | |
| Movie | 1969 | Mission: Impossible vs. the Mob | Rollin Hard | |
| Movie | 2004 | Ed Wood: Making Bela | Self / Bela Lugosi | |
| Movie | 2004 | Ed Wood: Let's Shoot This @#!% | Self | |
| Movie | 2004 | Ed Wood: Pie Plates Over Hollywood | Self (archive footage) | |
| Movie | 1982 | Alone in the Dark | Byron "Preacher" Sutcliff | |
| Movie | 1990 | Max and Helen | Simon Wiesenthal | |
| Movie | 2020 | TINSEL: The Lost Movie About Hollywood | Self | |
| Movie | 1994 | Time is Money | Mac | |
| Movie | 2003 | The Commission | Sen. Richard Russell | |
| Movie | 1987 | Delta Fever | Bud | |
| Movie | 2004 | Jack Nicholson: The Joker Is Wild | Self | |
| Movie | 1967 | Mission: Impossible - The Slave | Rollin Hand | |
| Movie | 1969 | Mission: Impossible - The Bunker | Rollin Hand | |
| Movie | N/A | The Return of Victor Bergman | Commander John Koenig (archive footage) | |
| TV Show | 2006 | The Evidence | Dr. Sol Goldman | 8 |
| TV Show | 1975 | Space: 1999 | John Koenig | 48 |
| TV Show | 1971 | Columbo | Dexter Paris / Norman Paris | 1 |
| TV Show | 1994 | Inside the Actors Studio | Self | 1 |
| TV Show | 1994 | Spider-Man | Mac Gargan / Scorpion (voice) | 1 |
| TV Show | 1989 | The Simpsons | The Great Raymondo (voice) | 1 |
| TV Show | 1985 | The Twilight Zone | William Cooper-Janes (segment "The Beacon") | 1 |
| TV Show | 2004 | Entourage | Bob Ryan | 4 |
| TV Show | 1996 | E! True Hollywood Story | | 1 |
| TV Show | 1985 | The New Alfred Hitchcock Presents | Wallace Garrison | 1 |
| TV Show | 1982 | Hotel | | 1 |
| TV Show | 2002 | Without a Trace | Frank Malone | 5 |
| TV Show | 1955 | Gunsmoke | Thorp | 1 |
| TV Show | 1948 | Studio One | | 1 |
| TV Show | 1953 | General Electric Theater | Apache Indian | 1 |
| TV Show | 1966 | Mission: Impossible | Rollin Hand | 75 |
| TV Show | 1960 | The Islanders | Arnie | 1 |
| TV Show | 1959 | Johnny Staccato | | 1 |
| TV Show | 1959 | The Twilight Zone | Dan Hotaling | 1 |
| TV Show | 1965 | I Spy | Danny Preston | 0 |
| TV Show | 1960 | The Tall Man | | 2 |
| TV Show | 1959 | The Twilight Zone | Major Ivan Kuchenko | 1 |
| TV Show | 1963 | The Greatest Show on Earth | | 1 |
| TV Show | 1960 | Outlaws | | 1 |
| TV Show | 1959 | The Lawless Years | | 1 |
| TV Show | 1965 | The Wild Wild West | | 1 |
| TV Show | 1982 | Matt Houston | | 1 |
| TV Show | 1965 | The Big Valley | Mariano Montoya | 1 |
| TV Show | 1959 | Adventures in Paradise | Sacheveral Sackett | 1 |
| TV Show | 1958 | Wanted: Dead or Alive | Khorba | 1 |
| TV Show | 1958 | The Rifleman | | 1 |
| TV Show | 1958 | Lawman | | 1 |
| TV Show | 1963 | Mr. Novak | Victor Rand | 1 |
| TV Show | 1959 | The Detectives | | 1 |
| TV Show | 1986 | Blacke's Magic | | 1 |
| TV Show | 1960 | Tate | | 1 |
| TV Show | 1959 | Johnny Ringo | Wes Tymon | 1 |
| TV Show | 1963 | The Outer Limits | Andro | 1 |
| TV Show | 1961 | The Defenders | Dr. Daniel Orren | 1 |
| TV Show | 1953 | The Oscars | Self | 4 |
| TV Show | 1964 | The Man from U.N.C.L.E. | Count Ladislaus Zark | 1 |
| TV Show | 1957 | Maverick | Mike Manning | 1 |
| TV Show | 2000 | In the Beginning | Abraham | 2 |
| TV Show | 1959 | The Untouchables | Jerry Fanning | 1 |
| TV Show | 1959 | The Untouchables | Larry Coombs | 1 |
| TV Show | 1959 | Adventures in Paradise | Miller | 1 |
| TV Show | 1989 | The Neon Empire | Max | 2 |
| TV Show | 1955 | Gunsmoke | Britton | 1 |
| TV Show | 1983 | Buffalo Bill | Hayden Stone | 1 |
| TV Show | 1963 | The Outer Limits | Richard Bellero | 1 |
| TV Show | 1965 | Branded | Edwin Booth | 1 |
| TV Show | 1965 | Get Smart | Maxwell Smart (uncredited) | 1 |
| TV Show | 1963 | Mr. Novak | Robert Coolidge | 1 |
| TV Show | 1959 | Bonanza | Emeliano | 1 |
| TV Show | 1951 | Schlitz Playhouse of Stars | | 1 |
| TV Show | 1994 | Spider-Man | Scorpion (voice) | 3 |
| TV Show | 1966 | Mission: Impossible | Rollin Hand / General Rio Dominguez | 1 |
| TV Show | 1961 | The Mike Douglas Show | Self | 1 |
| TV Show | 1967 | The Carol Burnett Show | Self - Guest / Various Characters | 1 |
| TV Show | 1995 | Joseph | Jacob | 2 |
| TV Show | 1962 | The Alfred Hitchcock Hour | Ned Murray | 1 |
| TV Show | 1984 | Murder, She Wrote | Al Drake | 1 |
| TV Show | 1944 | Golden Globe Awards | Self - Nominee | 1 |
| TV Show | 1952 | Omnibus | Jokanaan / John the Baptist | 1 |
| TV Show | 1968 | Rowan & Martin's Laugh-In | Self (uncredited) | 1 |
| TV Show | 2008 | In Plain Sight | Joseph Thomas / Joseph Tancredi | 1 |
