Aún no disponemos de datos de John O\'Leary en la Base
Filmografía parcial 
| --<>-- | ||
| All -- Movies -- TVmovie-Video -- TV Episodes | ||
| - | WAXWORK 2: LOST IN TIME (1991) ... Herr Vogel | |
| - | MONSTERS 3/56 A SHAVE AND A HAIRCUT, TWO BITES (1990) | |
| - |  STEPFATHER II (1989) ... Sam Watkins | |
| - | ISLAND, THE (1980) ... Doctor | |
| - | NERO WOLFE (1979) ... Theodore Horstmann | |
| - | DEMON SEED (1977) ... Royce | |
| - | FAREWELL MY LOVELY (1975) ... Lindsay Marriott | |
| - | ALFRED HITCHCOCK PRESENTS 04/144 THE WAXWORK (1959) ... Harry | |
| - | JULIUS CAESAR (1950) ... Marulo | |
