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| Title | Year | Status | Character |
|---|
| Bus Stop | 1956 | Life Magazine Photographer |
| The Birds and the Bees | 1956 | Duc Jacques de Montaigne |
| The Alcoa Hour | 1956 | TV Series | Schnobble |
| Ford Star Jubilee | 1956 | TV Series | Biggs |
| The NBC Comedy Hour | 1956 | TV Series | Airplane Passenger |
| Hour of Stars | 1955 | TV Series | Mr. Shellhammer |
| The 20th Century-Fox Hour | 1955 | TV Series | Mr. Shellhammer |
| Cavalcade of America | 1955 | TV Series | General Francis Marion |
| You're Never Too Young | 1955 | François (uncredited) |
| Four Star Playhouse | 1955 | TV Series | Reverend Tuttle |
| The Ray Milland Show | 1954-1955 | TV Series | Sheridan Wilson |
| The Pepsi-Cola Playhouse | 1955 | TV Series | Otto |
| Wife Unto Caesar | 1954 | TV Movie | Caesar |
| Crown Theatre with Gloria Swanson | 1954 | TV Series |
| Meet the Family | 1954 | TV Movie | Carlos Martinez |
| Ben and Me | 1953 | Short | Tom Jefferson / Crook (voice) |
| The Affairs of Dobie Gillis | 1953 | Professor Amos Pomfritt |
| The 5,000 Fingers of Dr. T. | 1953 | Dr. Terwilliker |
| I'll Buy That | 1953 | TV Series |
| The Twonky | 1953 | Kerry West |
| Siren of Bagdad | 1953 | Ben Ali |
| The Emperor's New Clothes | 1953 | Short | Various (voice) |
| Peter Pan | 1953 | Captain Hook
Mr. Darling (voice) |
| Johann Mouse | 1952 | Short | Narrator (voice) |
| I Love Lucy | 1952 | TV Series | Percy Livermore / Mr. Jenkins |
| Rebound | 1952 | TV Series |
| Mr. & Mrs. North | 1952 | TV Series | Enrique Romero |
| Big Jim McLain | 1952 | Robert Henried |
| The Unexpected | 1952 | TV Series | Kingsley Roacher / Kingsley Roachler |
| Three for Bedroom C | 1952 | Jack Bleck - Press Agent |
| The World in His Arms | 1952 | Eustace - Hotel Clerk |
| Frontiers of Faith | 1951 | TV Series |
| The Walt Disney Christmas Show | 1951 | TV Movie | Slave in the Magic Mirror |
| I'll See You in My Dreams | 1951 | William Rossiter (uncredited) |
| The Light Touch | 1951 | Leopold (uncredited) |
| Too Young to Kiss | 1951 | Mr. Sparrow |
| Texas Carnival | 1951 | Hotel Clerk |
| Behave Yourself! | 1951 | Norbert 'Gillie the Blade' Gillespie |
| Rich, Young and Pretty | 1951 | Jean - Maitre D' |
| New Mexico | 1951 | President Abraham Lincoln |
| Stars Over Hollywood | 1950 | TV Series |
| Summer Stock | 1950 | Harrison I. Keath |
| Nancy Goes to Rio | 1950 | Alfredo |
| On the Town | 1949 | Francois - Head Waiter (uncredited) |
| Bride for Sale | 1949 | Jewelry Salesman (uncredited) |
| Oboler Comedy Theatre | 1949 | TV Series |
| My Friend Irma | 1949 | Prof. Kropotkin |
| The Barkleys of Broadway | 1949 | Ladislaus Ladi (uncredited) |
| Variety Time | 1948 | Rudy La Paix |
| The Senator Was Indiscreet | 1947 | Waiter |
| Woody Dines Out | 1945 | Short | Taxidermist (voice, uncredited) |
| Sliphorn King of Polaroo | 1945 | Short | Narrator (voice) |
| Mrs. Parkington | 1944 | Mr. Ernst |
| Passage to Marseille | 1944 | Jourdain (uncredited) |
| His Butler's Sister | 1943 | Reeves |
| Crazy House | 1943 | Roco |
| A Lady Takes a Chance | 1943 | Gregg Stone |
| Hostages | 1943 | Lt. Glasenapp |
| Journey Into Fear | 1943 | Swami Magician |
| Hitler's Children | 1943 | Dr. Graf |
| Underground Agent | 1942 | Hugo |
| Nightmare | 1942 | Hans - Nazi Agent |
| Once Upon a Honeymoon | 1942 | Vienna Tailor's Fitter (uncredited) |
| The Greatest Gift | 1942 | Short | Father Fabian (uncredited) |
| The Big Street | 1942 | Louie - Headwaiter (uncredited) |
| The Falcon Takes Over | 1942 | Quincey W. Marriot (uncredited) |
| Pacific Rendezvous | 1942 | Park Hotel Desk Clerk (uncredited) |
| The Wife Takes a Flyer | 1942 | Hendrik Woverman |
| Saboteur | 1942 | Edward (uncredited) |
| Blondie's Blessed Event | 1942 | George Wickley |
| Joan of Paris | 1942 | Second Gestapo Agent (uncredited) |
| A Date with the Falcon | 1942 | Desk Clerk (uncredited) |
| The Gay Falcon | 1941 | Herman (uncredited) |
| Weekend for Three | 1941 | Desk Clerk |
| Unexpected Uncle | 1941 | Clayton - Manager at Brocks (uncredited) |
| Underground | 1941 | Herman - Underground Member (uncredited) |
| They Met in Argentina | 1941 | Guitar Player in Cantina (uncredited) |
| More About Nostradamus | 1941 | Short | Feliz Paretti later Pope Sixtus V (uncredited) |
| Maisie Was a Lady | 1941 | Georgie Porgie - House Guest (uncredited) |
| Bitter Sweet | 1940 | Rudolph - Man at Mama Luden's (uncredited) |
| The Great Dictator | 1940 | Undetermined Role (uncredited) |
| Dulcy | 1940 | Vincent Leach |
| On Borrowed Time | 1939 | Man in Convertible (uncredited) |
| It's a Wonderful World | 1939 | Stage Manager |
| Never Say Die | 1939 | Bit Part (uncredited) |
| Dramatic School | 1938 | Ramy |
| Fables and Legends | 1986 | Video short | Narrator |
| Allison Sydney Harrison | 1983 | TV Movie | Art appraiser |
| The Great Bear Scare | 1983 | TV Movie | Professor Werner von Bear (voice) |
| Barefoot in the Park | 1982 | TV Movie | Victor Velasco |
| ABC Weekend Specials | 1980-1982 | TV Series | Mordo / Tibbles |
| Fantasy Island | 1979-1982 | TV Series | J.D. Stoneman / George Boeufatou / Dr. Van Helsing |
| Through the Magic Pyramid | 1981 | TV Movie | Ay - Mr. Mantley |
| Spider-Man and His Amazing Friends | 1981 | TV Series | Red Skull
The Chameleon |
| American Dream | 1981 | TV Series | Abe Berlowitz |
| Faeries | 1981 | TV Short | Faerie King / Shadow (voice) |
| The Trolls and the Christmas Express | 1981 | TV Movie | Troglo (voice, as Hans Conreid) |
| Drak Pack | 1980 | TV Series | Dr. Dred |
| Oh, God! Book II | 1980 | Dr. Barnes |
| CBS Library | 1980 | TV Series | Professor Mickimecki |
| The Furious Flycycle | 1980 | Short | Professor Mickimecki (voice) |
| Walt Disney's Wonderful World of Color | 1955-1979 | TV Series | Slave in the Magic Mirror
Bigger-Than-Life
Thomas Jefferson
... |
| Supertrain | 1979 | TV Series | Hoffman |
| Alice | 1979 | TV Series | Randolph Briggs |
| The Love Boat | 1979 | TV Series | Karl Schmidt |
| Greatest Heroes of the Bible | 1979 | TV Series | King Nebuchadnezzar |
| Every Girl Should Have One | 1978 | Voice Characterizations (voice) |
| Laverne & Shirley | 1978 | TV Series | Lloyd Wilner |
| The Cat from Outer Space | 1978 | Dr. Heffel |
| The Tony Randall Show | 1977-1978 | TV Series | Wyatt Franklin |
| Quark | 1978 | TV Series | The Source |
| Hans in Luck | 1978 | Short voice |
| The Fisherman and His Wife | 1978 | Short voice |
| The Three Golden Hairs | 1978 | Short voice |
| The Youth Who Wanted to Shiver | 1978 | Short voice |
| Tom Thumb | 1978 | Short voice |
| The Hobbit | 1977 | TV Movie | Thorin Oakenshield (voice) |
| Halloween Is Grinch Night | 1977 | TV Short | The Grinch / Narrator (voice) |
| The Magic Pony | 1977 | voice |
| The Shaggy D.A. | 1976 | Prof. Whatley |
| Kolchak: The Night Stalker | 1975 | TV Series | Mendel Boggs |
| The Christmas Visit | 1973 | TV Movie | Spirit of Christmas |
| Dr. Seuss on the Loose | 1973 | TV Short | Narrator / North-Going Zax / South-Going Zax (voice) |
| Love, American Style | 1969-1973 | TV Series | Dexter Graymont (segment "Love and the Footlight Fiancee") / (segment "Love and the Split-Up") / Manfried the Great (segment "Love and the Tuba") / ... |
| Here's Lucy | 1973 | TV Series | William Barkley |
| Butch Cassidy | 1973 | TV Series voice |
| The Brothers O'Toole | 1973 | Polonius Vandergelt |
| The Partners | 1972 | TV Series | Adolph Zinser |
| O'Hara, U.S. Treasury | 1972 | TV Series | Count Anton Brelius |
| The Chicago Teddy Bears | 1971 | TV Series |
| Make Room for Granddaddy | 1970-1971 | TV Series | Uncle Tonoose |
| The Phantom Tollbooth | 1970 | King Azaz / The MathemaGician (voice) |
| Horton Hears a Who! | 1970 | TV Short | Narrator / Horton / Dr. H. Hoovey (voice) |
| Christmas Is | 1970 | TV Movie voice |
| The Debbie Reynolds Show | 1969 | TV Series | Mahesh Ugana |
| The Brady Bunch | 1969 | TV Series | Lance |
| Wake Me When the War Is Over | 1969 | TV Movie | Professor Herman Erhardt |
| Up Is Down | 1969 | Short | Narrator (voice) |
| Daniel Boone | 1968 | TV Series | Orlando, The Prophet |
| The Beverly Hillbillies | 1968 | TV Series | The Great Sebastian Stromboli |
| The Monkees | 1968 | TV Series | Mendrek |
| Cricket on the Hearth | 1967 | TV Movie | Tackleton (voice) |
| The Danny Thomas Hour | 1967 | TV Series | Gruff Tackelton / Van Plinkle / Uncle Tonoose |
| Kismet | 1967 | TV Movie | Wazir |
| Lost in Space | 1967 | TV Series | Sagramonte |
| Please Don't Eat the Daisies | 1966 | TV Series | Paul Handley |
| Hogan's Heroes | 1966 | TV Series | Major Bonacelli |
| The Farmer's Daughter | 1965 | TV Series |
| Gilligan's Island | 1964-1965 | TV Series | Wrongway Feldman |
| Ben Casey | 1965 | TV Series | Kevin Boone |
| Danny Thomas Reunion Special | 1965 | TV Movie | Uncle Tonoose |
| Burke's Law | 1964-1965 | TV Series | Leonid Borodny / Pepe Van Heller / Dr. Bing |
| Hoppity Hooper | 1964-1965 | TV Series | Professor Waldo Wigglesworth / Indian / Happy Folk #4 / ... |
| Harris Against the World | 1964 | TV Series |
| Dr. Kildare | 1964 | TV Series | Oliver Blair |
| The Patsy | 1964 | Prof. Mulerr |
| Robin and the 7 Hoods | 1964 | Mr. Ricks - Architect (uncredited) |
| Make Room for Daddy | 1955-1964 | TV Series | Uncle Tonoose / Derek Campbell / Cousin Carl / ... |
| The Lucy Show | 1963 | TV Series | Dr. Gitterman |
| The DuPont Show of the Week | 1963 | TV Series | Charles Hamilton |
| The United States Steel Hour | 1954-1963 | TV Series | Arthur Bannister / Bert Hay / Jean Pierre |
| My Six Loves | 1963 | Kinsley Kross |
| Mister Ed | 1962 | TV Series | Igor Korzak |
| Insight | 1962 | TV Series |
| Have Gun - Will Travel | 1961 | TV Series | Don Esteban Gutierrez Caloca |
| The Red Skelton Hour | 1955-1961 | TV Series | John Van Clive / Mr. Randolph / King Arthur / ... |
| Feathertop | 1961 | TV Movie | Governor Balfour |
| The Dudley Do-Right Show | 1959-1961 | TV Series | Snidely Whiplash |
| The Magic Fountain | 1961 | Otto the Owl (voice) |
| Adventures in Paradise | 1961 | TV Series | Dr. Mood |
| The DuPont Show with June Allyson | 1961 | TV Series | David Brent |
| The Islanders | 1961 | TV Series | Inspector Gardeva |
| Rocky and His Friends | 1961 | TV Series | Snidely Whiplash / Snidley Whiplash |
| The Bullwinkle Show | 1960 | TV Series | Snidely Whiplash (voice) |
| 1001 Arabian Nights | 1959 | The Wicked Wazir (voice) |
| Art Carney Special | 1959 | TV Series |
| The Ransom of Red Chief | 1959 | TV Movie | Sam Snyder |
| The Real McCoys | 1959 | TV Series | Sterling Ames |
| Juke Box Rhythm | 1959 | Balenko |
| The Alphabet Conspiracy | 1959 | TV Movie | Mad Hatter |
| The Donna Reed Show | 1959 | TV Series | Mr. Popkin |
| The Californians | 1958 | TV Series | Painless Pepper |
| Rock-a-Bye Baby | 1958 | Mr. Wright |
| Target | 1958 | TV Series | Corwin |
| Hansel and Gretel | 1958 | TV Movie | Witch |
| The Adventures of Jim Bowie | 1958 | TV Series | Cecil Algernon Justus |
| Omnibus | 1958 | TV Series | Iago in 'Othello' / Marcello in acted version of 'La Boheme' |
| Maverick | 1958 | TV Series | Homer Eakins |
| The Big Beat | 1958 | Vladimir Skilsky |
| The Unchained Goddess | 1958 | TV Movie | Apothecary (voice, uncredited) |
| Code 3 | 1957 | TV Series | The Killer |
| Dragnet | 1957 | TV Series | Paul Zavier |
| Climax! | 1957 | TV Series |
| The Lineup | 1955-1957 | TV Series | Slim Jameson / Tracy Powers / Eli Worth |
| The Woody Woodpecker Show | 1957 | TV Series | Wally Walrus (1944-1948) (voice) |
| Jet Pilot | 1957 | Col. Matoff |
| The Adventures of McGraw | 1957 | TV Series | Kryloff |
| Whirlybirds | 1957 | TV Series | George Carver |
| The Story of Anyburg U.S.A. | 1957 | Short | Prosecutor (voice, uncredited) |
| The Monster That Challenged the World | 1957 | Dr. Jess Rogers |
| Schlitz Playhouse | 1953-1957 | TV Series | Emory Caldwell / Warren Fitzjerner / Professor |
| The Bob Cummings Show | 1957 | TV Series | Schultzy's Suitor |
| Jane Wyman Presents The Fireside Theatre | 1957 | TV Series | Maurice Barrett |
| The New Adventures of Charlie Chan | 1957 | TV Series | Carlo Salvo |
| Playhouse 90 | 1956 | TV Series | Rene - French Waiter |
| Hey, Jeannie! | 1956 | TV Series | Rodney St. Roman |
| Saturday Spectacular: Manhattan Tower | 1956 | TV Movie | Village Artist |
| Studio 57 | 1956 | TV Series | Mr. Basel |