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| Año | Título | Personaje | Valoración |
|---|---|---|---|
| 1984 | Running Hot | Judge | ★★☆☆☆ |
| 1983 | Money to Burn | Henderson | ★★☆☆☆ |
| 1982 | T. J. Hooker | Chief Condon | ★★★☆☆ |
| 1974 | Los casos de Rockford | Mr. Rankin | ★★★★☆ |
| 1973 | Hawkins | Accountant | ★★★★☆ |
| 1971 | Billy Jack | Sheriff Cole | ★★★☆☆ |
| 1971 | Colombo | Doctor | ★★★★☆ |
| 1970 | Aeropuerto | Bert Weatherby | ★★★☆☆ |
| 1968 | Receta: Asesinato | Doctor (uncredited) | ★★★★☆ |
| 1968 | Área 12 | Harold Johnson | ★★★★☆ |
| 1967 | Dragnet | Capt. Henry O. Mack | ★★★☆☆ |
| 1964 | The Rogues | Peter Stewart | ★★★★☆ |
| 1964 | The Rogues | P. R. Man | ★★★★☆ |
| 1963 | Acusación de asesinato (A cualquier precio) | Reporter (uncredited) | ★★★☆☆ |
| 1962 | Should I Marry Outside My Faith? | ★☆☆☆☆ | |
| 1962 | The Lucy Show | Army Lieutenant | ★★★★☆ |
| 1960 | The High Powered Rifle | George Merkle | ★★★☆☆ |
| 1959 | Un paso al más allá | Jim Hennessey | ★★★☆☆ |
| 1957 | La garra gigante | Maj. Bergen | ★★☆☆☆ |
| 1957 | El temible Mr. Cory | Card Player (uncredited) | ★★★☆☆ |
| 1957 | Perry Mason | Tower Man | ★★★★☆ |
| 1957 | Perry Mason | Team Doctor | ★★★★☆ |
| 1957 | Perry Mason | Policeman | ★★★★☆ |
| 1956 | La Tierra contra los platillos volantes | Sgt. Nash (uncredited) | ★★★☆☆ |
| 1956 | The Adventures of Dr. Fu Manchu | Dr. John Petrie | ★★★☆☆ |
| 1955 | Ilegal | George Graves | ★★★☆☆ |
| 1955 | Más allá de las lágrimas | Marine Colonel (uncredited) | ★★★☆☆ |
| 1955 | Highway Patrol | Officer Hank | ★★★☆☆ |
| 1955 | Alfred Hitchcock presenta | Jim, a Bar Patron | ★★★★☆ |
| 1954 | De repente | Haggerty | ★★★☆☆ |
| 1953 | El autoestopista | Government Agent | ★★★☆☆ |
| 1953 | The Glass Web | Bob Warren | ★★★☆☆ |
| 1952 | Hermanos ante el peligro | Military Police Captain (uncredited) | ★★★☆☆ |
| 1952 | Adventures of Superman | Professor Roberts' Assistant | ★★★☆☆ |
| 1951 | All That I Have | George Wagnell | ★★★☆☆ |
| 1950 | La casa de juego | Nick (uncredited) | ★★★☆☆ |
| 1950 | The Beulah Show | Pete Bradley | ★★★★☆ |
| 1947 | De ilusión también se vive | Patron in Macy's Lunchroom (uncredited) | ★★★★☆ |
Películas destacadas de Clark Howat
Estas son las películas más destacadas en las que ha trabajdo:
Series
Las series más importantes en las que ha participado son las siguientes:
