o

- Oblong Box, The (1969, UK)
- Obsessed One, The (1974, Suriname)
- Octagon, The (1980, USA)
- Oddballs (1984, Canada)
- Odyssey: The Ultimate Trip (1977, USA)
- Old Dracula (1974, UK)
- Olga’s House of Shame (1964, USA)
- Olympic Fever (1979, USA)
- Omega Syndrome (1987, USA)
- On the Reeperbahn at Half Past Midnight (1969, Germany)
- Once Upon a Girl…. (1976, USA)
- Once Upon a Time in China (1991, Hong Kong)
- One Armed Boxer (1971, Taiwan / Hong Kong)
- One Armed Boxer 2 (1975, Taiwan / Hong Kong)
- One Armed Executioner, The (1983, Philippines)
- One-Armed Swordsman, The (1967, Hong Kong)
- One Down, Two to Go (1982, USA)
- One Girl’s Confession (1953, USA)
- One Million Years B.C. (1966, UK)
- One Thousand Cries Has the Night (1982, USA / Spain)
- One on Top of the Other (1969, Italy / Spain / France)
- One Way at a Time (1979, USA)
- Only a Coffin (1969, Spain / France)
- Opening of Misty Beethoven, The (1976, USA)
- Operation 67 (1967, Mexico)
- Operation Apocalypse (1966, Italy / Spain)
- Operation Bikini (1963, USA)
- Operation Delta Force 2: Mayday (1998, USA)
- Operation Fear (1966, Italy), combo, another combo
- Operation Makonaima (1974, Suriname)
- Operation Pink Squad II (1987, Hong Kong)
- Opposing Force (1986, USA)
- Orgasmo (1969, Italy / France)
- Orgazmo (1997, USA)
- Orgies of Dr. Orloff, The (1969, Spain / France)
- Orgy of the Dead (1965, USA)
- Orgy of the Dead, The (1973, Spain / Italy)
- Oriental Vixen (?,?)
- Orloff and the Invisible Man (1971, France / Spain), combo
- Our Man in Marrakesh (1966, UK)
- Our Men in Bagdad (1966, Italy / France)
- Out of the Dark (1989, USA)
- Outing, The (1987, USA)
- Outlaw Ladies (1981, USA)
- Outlaw Riders (1971, USA)