Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Actor | Psycho | 1960 | Norman Bates |
| Actor | Mord im Orientexpress | 1974 | Hector MacQueen |
| Actor | Psycho II | 1983 | Norman Bates |
| Actor | Psycho III | 1986 | |
| Director | Psycho III | 1986 | |
| Actor | Psycho IV: The Beginning | 1990 | Norman Bates |
| Actor | Das schwarze Loch | 1979 | Dr. Alex Durant |
| Actor | Der Prozess | 1962 | Josef K. |
| Actor | Brennt Paris? | 1966 | Sgt. Warren |
| Actor | Fifty Shades of Erotica | 2015 | |
| Actor | Chucky Invades Psycho | 2013 | Norman Bates |
| Actor | Catch-22 - Der böse Trick | 1970 | Chaplain Capt. A.T. Tappman |
| Writer | Sheila | 1973 | |
| Actor | 78/52 | 2017 | Himself |
| Actor | Das letzte Ufer | 1959 | Lt. Peter Holmes |
| Actor | China Blue bei Tag und Nacht | 1984 | Rev. Peter Shayne |
| Actor | Das war Roy Bean | 1972 | Reverend LaSalle |
| Actor | Tropenglut | 1959 | Abel |
| Actor | Mahagoni | 1975 | Sean McAvoy |
| Actor | Lockende Versuchung | 1956 | Josh Birdwell |
| Actor | Der Stern des Gesetzes | 1957 | Sheriff Ben Owens |
| Actor | Sprengkommando Atlantik | 1980 | Lou Kramer |
| Actor | Tab Hunter Confidential | 2015 | Himself (archive footage) |
| Actor | Lieben Sie Brahms? | 1961 | Philip Van der Besh |
| Actor | Der Engel mit der Mörderhand | 1968 | Dennis Pitt |
| Actor | Edge of Sanity | 1989 | Dr. Henry Jekyll / Jack 'The Ripper' Hyde |
| Actor | Philadelphia Clan | 1979 | John Cerruti |
| Actor | Die Verführerin | 1964 | Harry Compton / Nicolas Sergueiovitch Maukouline |
| Actor | Chillers | Host | |
| Actor | Daughter of Darkness | 1990 | Anton |
| Actor | Je länger, je lieber | 1960 | Ray Blent |