| The Furious Flycycle | 1980 | Professor Mickimecki (voice) | Short Film |
| Supertrain | 1979 | Hoffman | TV Show |
| CBS Library | 1979 | Professor Mickimecki | TV Show |
| The Cat from Outer Space | 1978 | Dr. Heffel | Movie |
| Greatest Heroes of the Bible | 1978 | King Nebuchadnezzar | TV Show |
| Every Girl Should Have One | 1978 | Voice Characterizations (voice) | Movie |
| Tom Thumb | 1978 | | Short Film |
| The Fisherman and His Wife | 1978 | | Short Film |
| The Three Golden Hairs | 1978 | | Short Film |
| The Youth Who Wanted to Shiver | 1978 | | Movie |
| Hans in Luck | 1978 | | Short Film |
| Halloween Is Grinch Night | 1977 | The Grinch / Narrator (voice) | TV Movie |
| The Hobbit | 1977 | Thorin Oakenshield (voice) | TV Movie |
| ABC Weekend Specials | 1977 | Mordo / Tibbles | TV Show |
| Fantasy Island | 1977 | J.D. Stoneman / George Boeufatou / Dr. Van Helsing | TV Show |
| Quark | 1977 | The Source | TV Show |
| The Love Boat | 1977 | Karl Schmidt | TV Show |
| The Shaggy D.A. | 1976 | Prof. Whatley | Movie |
| Alice | 1976 | Randolph Briggs | TV Show |
| Laverne & Shirley | 1976 | Lloyd Wilner | TV Show |
| The Tony Randall Show | 1976 | Wyatt Franklin | TV Show |
| The Humpbacked Horse | 1976 | | Movie |
| Model Railroading Unlimited | 1975 | Narrator | Short Film |
| Kolchak: The Night Stalker | 1974 | Mendel Boggs | TV Show |
| Dr. Seuss on the Loose | 1973 | Narrator / Sneetch by the Bonfire / North-Going Zax / ... (voice) | TV Movie |
| Butch Cassidy | 1973 | | TV Show |
| The Brothers O'Toole | 1973 | Polonius Vandergelt | Movie |
| Christmas Visit, The | 1973 | Spirit of Christmas | TV Movie |
| Shchelkunchik | 1973 | U.S. Narrator | Short Film |
| O'Hara, U.S. Treasury | 1971 | Count Anton Brelius | TV Show |
| The Chicago Teddy Bears | 1971 | | TV Show |
| The Partners | 1971 | Adolph Zinser | TV Show |
| The Phantom Tollbooth | 1970 | King Azaz / The MathemaGician (voice) | Movie |
| Horton Hears a Who! | 1970 | Narrator / Horton / Dr. H. Hoovey (voice) | TV Movie |
| Make Room for Granddaddy | 1970 | Uncle Tonoose | TV Show |
| Christmas Is | 1970 | Innkeeper (voice) | TV Movie |
| Wake Me When the War Is Over | 1969 | Professor Herman Erhardt | TV Movie |
| Love, American Style | 1969 | Dexter Graymont (segment "Love and the Footlight Fiancee") / (segment "Love and the Split-Up") / Manfried the Great (segment "Love and the Tuba") / ... | TV Show |
| The Brady Bunch | 1969 | Lance | TV Show |
| The Debbie Reynolds Show | 1969 | Mahesh Ugana | TV Show |
| The Dudley Do-Right Show | 1969 | Snidely Whiplash | TV Show |
| Up Is Down | 1969 | Narrator (voice) | Short Film |
| Here's Lucy | 1968 | William Barkley | TV Show |
| George of the Jungle | 1967 | Narrator | TV Show |
| Off to See the Wizard | 1967 | Captain Sinbad | TV Show |
| The Danny Thomas Hour | 1967 | Gruff Tackelton / Van Plinkle / Uncle Tonoose | TV Show |
| Cricket on the Hearth | 1967 | Tackleton (voice) | TV Movie |
| Kismet | 1967 | Wazir | TV Movie |
| The Lone Ranger | 1966 | | TV Show |
| The Monkees | 1966 | Mendrek | TV Show |
| Hogan's Heroes | 1965 | Major Bonacelli | TV Show |
| Lost in Space | 1965 | Sagramonte | TV Show |
| Please Don't Eat the Daisies | 1965 | Paul Handley | TV Show |
| Robin and the 7 Hoods | 1964 | Mr. Ricks (uncredited) | Movie |
| The Patsy | 1964 | Prof. Mulerr | Movie |
| Daniel Boone | 1964 | Orlando, The Prophet | TV Show |
| Gilligan's Island | 1964 | Wrongway Feldman | TV Show |
| Hoppity Hooper | 1964 | Professor Waldo Wigglesworth / Indian / Happy Folk #4 / ... | TV Show |
| Harris Against the World | 1964 | Marv Colodney | TV Show |
| My Six Loves | 1963 | Kinsley Kross | Movie |
| Burke's Law | 1963 | Leonid Borodny / Pepe Van Heller / Dr. Bing | TV Show |
| The Farmer's Daughter | 1963 | | TV Show |
| The Beverly Hillbillies | 1962 | The Great Sebastian Stromboli / Wolf 5 | TV Show |
| The Lucy Show | 1962 | Dr. Gitterman | TV Show |
| Tex & Judy | 1962 | Narrator (voice) | Short Film |
| Ben Casey | 1961 | Kevin Boone | TV Show |
| Dr. Kildare | 1961 | Oliver Blair | TV Show |
| The DuPont Show of the Week | 1961 | Charles Hamilton | TV Show |
| The Magic Fountain | 1961 | Otto the Owl (voice) | Movie |
| Feathertop | 1961 | Governor Balfour | TV Movie |
| Insight | 1960 | Dr. John Faustus | TV Show |
| The Islanders | 1960 | Inspector Gardeeva / Inspector Gardeva | TV Show |
| Faces and Fortunes | 1960 | Narrator (voice) | Short Film |
| 1001 Arabian Nights | 1959 | The Wicked Wazir / Magic Flame (voice) | Movie |
| Magic Boy | 1959 | | Movie |
| Sleeping Beauty | 1959 | Lord Duke (uncredited) | Movie |
| Adventures in Paradise | 1959 | Dr. Mood | TV Show |
| Rocky and His Friends | 1959 | Snidely Whiplash / Snidley Whiplash / Red Wood | TV Show |
| The DuPont Show with June Allyson | 1959 | David Brent | TV Show |
| Juke Box Rhythm | 1959 | Balenko | Movie |
| The Alphabet Conspiracy | 1959 | Mad Hatter | TV Movie |
| The Ransom of Red Chief | 1959 | Sam Snyder | TV Movie |
| Rock-a-Bye Baby | 1958 | Mr. Wright | Movie |
| The Unchained Goddess | 1958 | Apothecary (voice, uncredited) | TV Movie |
| Mister Ed | 1958 | Igor Korzak | TV Show |
| The Donna Reed Show | 1958 | Mr. Popkin | TV Show |
| The Big Beat | 1958 | Vladimir Skilsky | Movie |
| Target | 1958 | Corwin | TV Show |
| Hansel and Gretel | 1958 | Witch | TV Movie |
| Jet Pilot | 1957 | Col. Matoff | Movie |
| The Monster That Challenged the World | 1957 | Dr. Jess Rogers | Movie |
| Have Gun - Will Travel | 1957 | The Knight | TV Show |
| Maverick | 1957 | Homer Eakins | TV Show |
| The New Adventures of Charlie Chan | 1957 | Carlo Salvo | TV Show |
| The Real McCoys | 1957 | Sterling Ames | TV Show |
| Whirlybirds | 1957 | George Carver | TV Show |
| The Adventures of McGraw | 1957 | Kryloff | TV Show |
| The Californians | 1957 | Painless Pepper | TV Show |
| The Story of Anyburg U.S.A. | 1957 | Prosecutor (voice, uncredited) | Short Film |
| The O. Henry Playhouse | 1957 | Clarence | TV Show |
| Captain David Grief | 1957 | Shakespearean Actor | TV Show |
| Bus Stop | 1956 | Life Magazine Photographer | Movie |
| The Birds and the Bees | 1956 | Duc Jacques de Montaigne | Movie |
| Hey, Jeannie! | 1956 | Rodney St. Roman | TV Show |
| Playhouse 90 | 1956 | Rupert | TV Show |
| The Adventures of Jim Bowie | 1956 | Cecil Algernon Justus | TV Show |
| The NBC Comedy Hour | 1956 | Airplane Passenger | TV Show |
| Saturday Spectacular: Manhattan Tower | 1956 | Village Artist | TV Movie |
| Davy Crockett: King of the Wild Frontier | 1955 | Thimblerig | Movie |
| You're Never Too Young | 1955 | François (uncredited) | Movie |
| Ford Star Jubilee | 1955 | Biggs | TV Show |
| Jane Wyman Presents The Fireside Theatre | 1955 | Maurice Barrett | TV Show |
| The 20th Century-Fox Hour | 1955 | Mr. Shellhammer | TV Show |
| The Bob Cummings Show | 1955 | Schultzy's Suitor | TV Show |
| The Alcoa Hour | 1955 | Schnobble | TV Show |
| Climax! | 1954 | | TV Show |
| Studio 57 | 1954 | Mr. Basel | TV Show |
| The Lineup | 1954 | Slim Jameson / Tracy Powers | TV Show |
| The Magical World of Disney | 1954 | Slave in the Magic Mirror / Bigger-Than-Life / Thomas Jefferson / ... | TV Show |
| Wife Unto Caesar | 1954 | Caesar | TV Movie |
| Meet the Family | 1954 | Carlos Martinez | TV Movie |
| Peter Pan | 1953 | Captain Hook / Mr. Darling (voice) | Movie |
| The 5,000 Fingers of Dr. T. | 1953 | Dr. Terwilliker | Movie |
| The Affairs of Dobie Gillis | 1953 | Professor Amos Pomfritt | Movie |
| The Twonky | 1953 | Kerry West | Movie |
| Ben and Me | 1953 | Tom Jefferson / Crook (voice) | Short Film |
| Make Room for Daddy | 1953 | Uncle Tonoose / Derek Campbell / Cousin Carl / ... | TV Show |
| The Pepsi-Cola Playhouse | 1953 | Otto | TV Show |
| The United States Steel Hour | 1953 | Arthur Bannister / Bert Hay / Jean Pierre | TV Show |
| Siren of Bagdad | 1953 | Ben Ali | Movie |
| The Ray Milland Show | 1953 | Sheridan Wilson | TV Show |
| The Emperor's New Clothes | 1953 | Tailors / King / King's Aide / ... (voice) | Short Film |
| Big Jim McLain | 1952 | Robert Henried | Movie |
| The World in His Arms | 1952 | Eustace - Hotel Clerk | Movie |
| Cavalcade of America | 1952 | General Francis Marion | TV Show |
| Four Star Playhouse | 1952 | Reverend Tuttle | TV Show |
| Mr. & Mrs. North | 1952 | Enrique Romero | TV Show |
| Omnibus | 1952 | Iago in 'Othello' / Marcello in acted version of 'La Boheme' | TV Show |
| Three for Bedroom C | 1952 | Jack Bleck - Press Agent | Movie |
| Crown Theatre with Gloria Swanson | 1952 | | TV Show |
| Rebound | 1952 | | TV Show |
| Johann Mouse | 1952 | Narrator (voice) | Short Film |
| The Unexpected | 1952 | Kingsley Roacher / Kingsley Roachler | TV Show |
| Behave Yourself! | 1951 | Norbert 'Gillie the Blade' Gillespie | Movie |
| I'll See You in My Dreams | 1951 | William Rossiter (uncredited) | Movie |
| New Mexico | 1951 | President Abraham Lincoln (uncredited) | Movie |
| Texas Carnival | 1951 | Hotel Clerk | Movie |
| The Light Touch | 1951 | Leopold (uncredited) | Movie |
| Too Young to Kiss | 1951 | Mr. Sparrow | Movie |
| I Love Lucy | 1951 | Percy Livermore / Mr. Jenkins | TV Show |
| Schlitz Playhouse | 1951 | Emory Caldwell / Warren Fitzjerner / Professor / ... | TV Show |
| The Red Skelton Hour | 1951 | John Van Clive / Mr. Randolph / King Arthur / ... | TV Show |
| Rich, Young and Pretty | 1951 | Jean (Maitre D') | Movie |
| Frontiers of Faith | 1951 | | TV Show |
| Dragnet | 1951 | Paul Zavier | TV Show |
| Nancy Goes to Rio | 1950 | Alfredo | Movie |
| Summer Stock | 1950 | Harrison I. Keath | Movie |
| Stars Over Hollywood | 1950 | Violinst | TV Show |
| Bride for Sale | 1949 | Jewelry Salesman (uncredited) | Movie |
| My Friend Irma | 1949 | Prof. Kropotkin | Movie |
| On the Town | 1949 | Francois - Head Waiter (uncredited) | Movie |
| The Barkleys of Broadway | 1949 | Ladislaus Ladi (uncredited) | Movie |
| Oboler Comedy Theatre | 1949 | | TV Show |
| Variety Time | 1948 | Rudy La Paix | Movie |
| The Senator Was Indiscreet | 1947 | Karl - Waiter | Movie |
| The Mel Blanc Show | 1946 | Mr. Cushing | TV Show |
| Sliphorn King of Polaroo | 1945 | Narrator / Crocodile (voice) | Short Film |
| Woody Dines Out | 1945 | Taxidermist (voice, uncredited) | Short Film |
| Mrs. Parkington | 1944 | Mr. Ernst | Movie |
| Passage to Marseille | 1944 | Jourdain (uncredited) | Movie |
| A Lady Takes a Chance | 1943 | Gregg Stone | Movie |
| His Butler's Sister | 1943 | Reeves | Movie |
| Hitler's Children | 1943 | Dr. Graf | Movie |
| Journey Into Fear | 1943 | Swami Magician | Movie |
| Crazy House | 1943 | Roco | Movie |
| Hostages | 1943 | Lt. Glasenapp | Movie |
| A Date with the Falcon | 1942 | Desk Clerk (uncredited) | Movie |
| Joan of Paris | 1942 | Second Gestapo Agent (uncredited) | Movie |
| Once Upon a Honeymoon | 1942 | Vienna Tailor's Fitter (uncredited) | Movie |
| Saboteur | 1942 | Edward (uncredited) | Movie |
| The Big Street | 1942 | Louie - Headwaiter (uncredited) | Movie |
| The Falcon Takes Over | 1942 | Quincey W. Marriot (uncredited) | Movie |
| Blondie's Blessed Event | 1942 | George Wickley | Movie |
| Nightmare | 1942 | Hans - Nazi Agent | Movie |
| Pacific Rendezvous | 1942 | Park Hotel Desk Clerk (uncredited) | Movie |
| The Wife Takes a Flyer | 1942 | Hendrik Woverman | Movie |
| The Greatest Gift | 1942 | Father Fabian (uncredited) | Short Film |
| Underground Agent | 1942 | Hugo | Movie |
| The Gay Falcon | 1941 | Herman (uncredited) | Movie |
| They Met in Argentina | 1941 | Guitar Player in Cantina (uncredited) | Movie |
| Underground | 1941 | Herman (uncredited) | Movie |
| More About Nostradamus | 1941 | Feliz Paretti later Pope Sixtus V (uncredited) | Short Film |
| Maisie Was a Lady | 1941 | Georgie Porgie - House Guest (uncredited) | Movie |
| Unexpected Uncle | 1941 | Clayton (uncredited) | Movie |
| Abdul the Bulbul Ameer | 1941 | Abdul (uncredited) | Short Film |
| Weekend for Three | 1941 | Desk Clerk | Movie |
| Bitter Sweet | 1940 | Rudolph - Man at Mama Luden's (uncredited) | Movie |
| The Great Dictator | 1940 | Undetermined Role (uncredited) | Movie |
| Dulcy | 1940 | Vincent Leach | Movie |
| It's a Wonderful World | 1939 | Delmonico - Stage Manager | Movie |
| Never Say Die | 1939 | Concertina Player (uncredited) | Movie |
| On Borrowed Time | 1939 | Man in Convertible (uncredited) | Movie |
| Dramatic School | 1938 | Ramy | Movie |
