Movies:
* The Last Supper (1976) - Judas Iscariot
* The Fifth Horseman (1975) - Helmut
* The Man Who Loved Cat Dancing (1973) - Bartender
* The Day of the Dolphin (1973) - Dr. Max Kramer
* The Last of Sheila (1973) - Tony
Television:
* The Bold Ones: The New Doctors (1969-1973) - Dr. Michael Rossi
* The F.B.I. (1965-1974) - Various roles in 4 episodes
* Mannix (1967-1975) - Various roles in 4 episodes
* The Rockford Files (1974-1980) - Various roles in 3 episodes
* Charlie's Angels (1976-1981) - Various roles in 3 episodes
* The Love Boat (1977-1986) - Various roles in 4 episodes
* Fantasy Island (1977-1984) - Various roles in 2 episodes
* Murder, She Wrote (1984-1996) - Various roles in 3 episodes
Other Projects:
* He had a recurring role on the daytime soap opera General Hospital from 1971-1973.
Please note that this list may not be exhaustive, as Gerard Cox has had a long and varied career in entertainment.