Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Actor | Psyco | 1960 | Norman Bates |
| Actor | Assassinio sull'Orient Express | 1974 | Hector MacQueen |
| Actor | Psycho II | 1983 | Norman Bates |
| Actor | Psycho III | 1986 | |
| Director | Psycho III | 1986 | |
| Actor | Psycho IV | 1990 | Norman Bates |
| Actor | The Black Hole - Il buco nero | 1979 | Dr. Alex Durant |
| Actor | Il processo | 1962 | Josef K. |
| Actor | Parigi brucia? | 1966 | Sgt. Warren |
| Actor | Fifty Shades of Erotica | 2015 | |
| Actor | Chucky Invades Psycho | 2013 | Norman Bates |
| Actor | Comma 22 | 1970 | Chaplain Capt. A.T. Tappman |
| Writer | Un rebus per l'assassino | 1973 | |
| Actor | 78/52 | 2017 | Himself |
| Actor | L'ultima spiaggia | 1959 | Lt. Peter Holmes |
| Actor | China Blue | 1984 | Rev. Peter Shayne |
| Actor | L'uomo dai 7 capestri | 1972 | Reverend LaSalle |
| Actor | Verdi dimore | 1959 | Abel |
| Actor | Mahogany | 1975 | Sean McAvoy |
| Actor | La legge del Signore | 1956 | Josh Birdwell |
| Actor | Il segno della legge | 1957 | Sheriff Ben Owens |
| Actor | Attacco: piattaforma Jennifer | 1980 | Lou Kramer |
| Actor | Tab Hunter Confidential | 2015 | Himself (archive footage) |
| Actor | Le piace Brahms? | 1961 | Philip Van der Besh |
| Actor | Dolce veleno | 1968 | Dennis Pitt |
| Actor | Dr. Jekyll e Mr. Hyde: sull'orlo della follia | 1989 | Dr. Henry Jekyll / Jack 'The Ripper' Hyde |
| Actor | Rebus per un assassino | 1979 | John Cerruti |
| Actor | Un'adorabile idiota | 1964 | Harry Compton / Nicolas Sergueiovitch Maukouline |
| Actor | Chillers | Host | |
| Actor | Figlia delle tenebre | 1990 | Anton |
| Actor | In punta di piedi | 1960 | Ray Blent |