| Year | Title | Role | Notes |
|---|
| 1949 | The Christmas Carol | Narrator (voice) | Television special |
| 1952 | Robert Montgomery Presents | Peter Hammond | Episode "The Ringmaster" |
| 1953 | Summer Theatre | Cooper Fielding | Episode: "Dream Job" |
| The Plymouth Playhouse |
| 1955 | Climax! | Gideon Rone | Episode "Night of Execution" |
| Crossroads | Reverend Robert Russell | Episode "Cleanup" |
| TV Reader's Digest | John Hayes | Episode "The Brainwashing of John Hayes" |
| 1956 | Science Fiction Theatre | Dr. Philip Redmond | Episode "Operation Flypaper" |
| Gary Williams | Episode "One Thousand Eyes" |
| Crossroads | Reverend Alfred Price | Episode "God's Healing" |
| 1956–1971 | The Red Skelton Hour | Claude Casserole, Dr. Nelson Jr., Dr. Flygrabber, various characters | 17 episodes |
| 1957 | Alfred Hitchcock Presents | Charles Courtney | Episode "The Perfect Crime" |
| Collector's Item: The Left Fist of David | Henry Prentiss | Television film |
| 1958 | Have Gun – Will Travel | Charles Matthews / Othello | Episode "The Moor's Revenge" |
| 1959 | Riverboat | Otto Justin | Episode "Witness No Evil" |
| 1960 | The Red Skelton Hour | Gilbert | Episode: "The Original DaVinci" |
| Maxwell the Magician | Episode "Deadeye and the Magician" |
| 1964–1966 | The Danny Kaye Show | Gangster, Dr. Frankenstein, The Dentist, The Prime Minister, Art Collector and Critic, The snotty Maitre'd | 4 episodes |
| 1965 | The Man from U.N.C.L.E. | Victor Marton | Episode "The Foxes and Hounds Affair" |
| 1966–1967 | Batman | Edgar Heed / Egghead | 7 episodes |
| 1967 | F Troop | Count Sfoza | Episode "V is for Vampire" |
| Voyage to the Bottom of the Sea | Professor Multiple | Episode "The Deadly Dolls" |
| 1968–1971 | Rowan & Martin's Laugh-In | Guest Performer | 5 episodes |
| 1969 | Daniel Boone | Dr. Thaddeus Morton | Episode "Copperhead Izzy" |
| The Good Guys | Mr. Middleton | Episode "Fly in My Stew" |
| Get Smart | Dr. Jarvis Pym | Episode "Is This Trip Necessary?" |
| 1970 | Mod Squad | John Wells / Wentworth | Episode "A Time of Hyacinths" |
| Here's Lucy | Himself | Episode "Lucy Cuts Vincent's Price" |
| 1971 | What's a Nice Girl Like You...? | William Spevin | Television film |
| The Hilarious House of Frightenstein | Himself | 130 episodes |
| The Pet Set | 2 episodes |
| Curiosity Shop | Himself/Master of Scaremonies | Episode “Where Do You Go to Get Out of a Scare?” |
| 1971–1972 | Night Gallery | Professor, John | 2 episodes |
| 1972 | The Jimmy Stewart Show | Himself | Episode "Price Is Right" |
| The Brady Bunch | Professor Hubert Whitehead | 2 episodes |
| 1972–1975 | The Carol Burnett Show | Guest Performer | 4 episodes [2] |
| 1973 | Columbo | David Lang | Episode "Lovely but Lethal" |
| 1974 | The Snoop Sisters | Michael Bastion | Episode "A Black Day for Bluebeard" |
| Mooch | Himself | Television film |
| 1976 | Ellery Queen | Michael Raynor | Episode "The Adventure of the Sinister Scenario" |
| The Bionic Woman | Manfred / Cyrus Carstairs | Episode "Black Magic" |
| 1977 | The Muppet Show | Himself | 1 episode |
| The Brady Bunch Hour |
| 1978 | The Love Boat | The Amazing Alonzo | Episode "Ship of Ghouls" |
| 1979 | Time Express | Jason Winters | 4 episodes |
| CBS Library | Narrator | Episode "Once Upon a Midnight Scary" |
|
| 1981 | Red Skelton's Christmas Dinner | Professor Humperdo | Television special |
| 1983 | Hansel and Gretel | Host | Television film |
| Ruddigore | Sir Despard Murgatroyd |
| 1984 | Faerie Tale Theatre | Magic Mirror, Narrator | 2 episodes |
| 1985 | The 13 Ghosts of Scooby-Doo | Vincent Van Ghoul (voice) | 13 episodes |
| 1986 | The Greatest Adventure: Stories from the Bible | King Herod (voice) | Episode "The Nativity" |
| Blacke's Magic | Emeric Valdemar | Episode "Wax Poetic" |
| Escapes | Host / The Mailman | Television film |
| 1987 | The Little Troll Prince | King Ulvik #1 (voice) |
| 1988 | Ghost Ship | Narrator (voice) | Television film, English dub |
| 1991 | Tiny Toon Adventures | Edgar Allan Poe (voice) | Episode "How Sweetie It Is" |
| 1992 | The Heart of Justice | Reggie Shaw | Television film |