William Smithers was an American film and television actor.
| Series | Walker, Texas Ranger | Unknown | 1993-04-21 |
| Series | Sledge Hammer! | Unknown | 1986-09-23 |
| Series | Hunter | Unknown | 1984-09-18 |
| Series | Scarecrow and Mrs. King | Unknown | 1983-10-03 |
| Movie | Where the Ladies Go | Mullen | 1980-03-14 |
| Movie | The Return of Frank Cannon | William Barrett | 1980-10-31 |
| Movie | Deathsport | Doctor Karl | 1978-04-01 |
| Series | Lucan | Unknown | 1977-09-12 |
| Series | Quincy, M.E. | Unknown | 1976-10-03 |
| Series | The Manhunter | Unknown | 1974-09-11 |
| Movie | Papillon | Warden Barrot | 1973-12-16 |
| Movie | Scorpio | Mitchell | 1973-04-11 |
| Series | The Streets of San Francisco | Unknown | 1972-09-23 |
| Series | The Rookies | Unknown | 1972-09-11 |
| Movie | Trouble Man | Captain Joe Marx | 1972-11-01 |
| Movie | The Neon Ceiling | Doctor Miller | 1971-02-08 |
| Series | Cannon | Unknown | 1971-09-14 |
| Movie | The Brotherhood of the Bell | Dr. Jerry Fielder | 1970-09-17 |
| Series | Marcus Welby, M.D. | Unknown | 1969-09-23 |
| Movie | The Monk | Leo Barnes | 1969-10-21 |
| Series | The Mod Squad | Unknown | 1968-09-24 |
| Series | Hawaii Five-O | Unknown | 1968-09-20 |
| Series | Ironside | Unknown | 1967-03-28 |
| Series | Judd for the Defense | Unknown | 1967-09-08 |
| Series | Mannix | Unknown | 1967-09-16 |
| Series | Tarzan | Unknown | 1966-09-08 |
| Series | Felony Squad | Unknown | 1966-09-12 |
| Series | Star Trek | Captain R.M. Merik | 1966-09-08 |
| Series | Jericho | Unknown | 1966-09-15 |
| Series | Mission: Impossible | Unknown | 1966-09-17 |
| Series | The F.B.I. | Unknown | 1965-09-19 |
| Movie | The Parisienne and the Prudes | Henry | 1964-04-29 |
| Series | Combat! | Unknown | 1962-10-02 |
| Movie | Attack | Harry Woodruff | 1956-09-19 |
| Series | Omnibus | Unknown | 1952-11-09 |
| Series | Hallmark Hall of Fame | Unknown | 1951-12-24 |
| Series | The Philco Television Playhouse | Unknown | 1948-10-03 |
| Series | Studio One | Unknown | 1948-11-07 |