- Oblivion ( 2013 ) Action, Adventure, Mystery, Science Fiction
- Observance ( 2016 ) Horror, Mystery, Thriller
- Obsession ( 1976 ) Drama, Mystery, Thriller
- Octane ( 2003 ) Horror, Mystery, Thriller
- Odd Thomas ( 2013 ) Mystery, Thriller
- Off Limits ( 1988 ) Action, Crime, Drama, Mystery, Thriller
- Ogaryova Street, Number 6 ( 1980 ) Crime, Mystery
- Oh! Blue Fish Island ( 1977 ) Mystery
- Oldboy ( 2003 ) Action, Drama, Mystery, Thriller
- Oldboy ( 2013 ) Action, Drama, Mystery, Thriller
- Omen IV: The Awakening ( 1991 ) Fantasy, Horror, Mystery
- On Probation ( 2005 ) Action, Comedy, Crime, Drama, Mystery
- Onaayum Aattukkuttiyum ( 2013 ) Crime, Drama, Mystery, Thriller
- Once Upon a Crime ( 1992 ) Comedy, Crime, Mystery
- Once Upon a Honeymoon ( 1942 ) Comedy, Mystery, Romance
- One Body Too Many ( 1944 ) Comedy, Mystery, Thriller
- One Deadly Summer ( 1983 ) Drama, Mystery
- One Minute Time Machine ( 2014 ) Comedy, Mystery, Romance
- One Missed Call ( 2008 ) Horror, Mystery, Thriller
- One of Our Dinosaurs Is Missing ( 1975 ) Action, Adventure, Comedy, Drama, Family, Mystery, Thriller
- One on Top of the Other ( 1969 ) Mystery, Thriller
- One Way ( 2006 ) Crime, Foreign, Mystery, Thriller
- Only God Knows ( 2006 ) Drama, Foreign, Mystery, Romance, Thriller
- Onus ( 2016 ) Drama, Mystery, Thriller
- Open Grave ( 2013 ) Horror, Mystery, Thriller
- Opera ( 1987 ) Horror, Mystery, Thriller
- Oriana ( 1985 ) Drama, Mystery, Romance
- Orphan ( 2009 ) Horror, Mystery, Thriller
- Our Man In Marrakesh ( 1966 ) Adventure, Comedy, Crime, Mystery
- Our Town ( 2007 ) Crime, Drama, Mystery
- Out of the Past ( 1947 ) Drama, Mystery, Thriller
- Outrageous Fortune ( 1987 ) Action, Comedy, Mystery
- Overheard 3 ( 2014 ) Action, Crime, Mystery, Thriller
- Oxygen ( 1999 ) Crime, Drama, Mystery, Thriller
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