- O-Bi, O-Ba: The End of Civilization ( 1985 ) Drama, Science Fiction
- Oasis ( 2017 ) Drama, Science Fiction, TV Movie
- Oblivion ( 1994 ) Adventure, Comedy, Science Fiction, Western
- Oblivion ( 2013 ) Action, Adventure, Mystery, Science Fiction
- Officer Downe ( 2016 ) Action, Comedy, Science Fiction
- Ogre ( 2008 ) Horror, Science Fiction
- Okja ( 2017 ) Adventure, Drama, Fantasy, Science Fiction
- Omega Doom ( 1996 ) Science Fiction
- OMG, I'm a Robot! ( 2015 ) Comedy, Science Fiction
- Æon Flux ( 2005 ) Action, Science Fiction
- On the Beach ( 1959 ) Drama, Romance, Science Fiction
- On the Beach ( 2000 ) Drama, Science Fiction
- On the Comet ( 1970 ) Adventure, Fantasy, Science Fiction
- On the Double ( 1961 ) Action, Comedy, Foreign, Science Fiction, War
- On the Silver Globe ( 1988 ) Adventure, Fantasy, Science Fiction
- On Your Mark ( 1995 ) Animation, Music, Science Fiction
- Once Upon a Warrior ( 2011 ) Action, Adventure, Family, Fantasy, Foreign, Science Fiction
- One Day Like Rain ( 2007 ) Drama, Science Fiction
- One Hundred Mornings ( 2009 ) Drama, Science Fiction, Thriller
- One Point O ( 2004 ) Science Fiction
- Operation Ganymed ( 1977 ) Science Fiction
- Orbiter 9 ( 2017 ) Drama, Romance, Science Fiction
- Origin ( 2016 ) Action, Drama, Science Fiction, Thriller
- Origin: Spirits of the Past ( 2006 ) Action, Adventure, Animation, Drama, Fantasy, Romance, Science Fiction
- Orion's Key ( 1996 ) Science Fiction
- Our Man Flint ( 1966 ) Adventure, Comedy, Fantasy, Science Fiction
- Our RoboCop Remake ( 2014 ) Action, Comedy, Crime, Science Fiction
- Outbreak ( 1995 ) Action, Drama, Science Fiction, Thriller
- Outland ( 1981 ) Science Fiction
- Outlander ( 2008 ) Action, Fantasy, Science Fiction
- Outlanders ( 1986 ) Animation, Comedy, Science Fiction
- Outlaw of Gor ( 1988 ) Action, Fantasy, Science Fiction
- Outpost: Rise of the Spetsnaz ( 2013 ) Action, Horror, Science Fiction
- OzLand ( 2015 ) Drama, Fantasy, Science Fiction
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