- Oasis of the Zombies ( 1982 ) Horror
- Observance ( 2016 ) Horror, Mystery, Thriller
- Occupant ( 2011 ) Horror, Thriller
- Octane ( 2003 ) Horror, Mystery, Thriller
- Octopus 2: River of Fear ( 2001 ) Horror
- Octopus ( 2000 ) Action, Horror, Thriller
- Oculus ( 2013 ) Horror
- Of Unknown Origin ( 1983 ) Horror
- Offerings ( 1989 ) Horror
- Office Killer ( 1997 ) Comedy, Horror, Thriller
- Offspring ( 2009 ) Horror
- Ogre ( 2008 ) Horror, Science Fiction
- Old 37 ( 2015 ) Horror
- Omen III: The Final Conflict ( 1981 ) Drama, Horror, Thriller
- Omen IV: The Awakening ( 1991 ) Fantasy, Horror, Mystery
- On the Brain ( 2016 ) Crime, Horror, Thriller
- Once Bitten ( 1985 ) Comedy, Horror, Romance
- One Dark Night ( 1983 ) Horror
- One-Eyed Monster ( 2008 ) Comedy, Horror
- One Hour Photo ( 2002 ) Horror, Thriller
- One Million B.C. ( 1940 ) Fantasy, Horror
- One Missed Call 2 ( 2005 ) Horror, Thriller
- One Missed Call ( 2003 ) Horror, Thriller
- One Missed Call ( 2008 ) Horror, Mystery, Thriller
- One Missed Call 3: Final ( 2006 ) Horror
- One Night in A City ( 2007 ) Animation, Fantasy, Horror
- Oneechanbara The Movie ( 2008 ) Action, Horror
- Onibaba ( 1964 ) Horror
- Onmyoji: The Yin Yang Master ( 2001 ) Drama, Fantasy, Horror
- Open Grave ( 2013 ) Horror, Mystery, Thriller
- Open Graves ( 2009 ) Horror, Thriller
- Open House ( 2010 ) Drama, Horror, Thriller
- Open Water 2: Adrift ( 2006 ) Drama, Horror, Thriller
- Opera ( 1987 ) Horror, Mystery, Thriller
- Orca: The Killer Whale ( 1977 ) Adventure, Drama, Horror
- Orgy of the Dead ( 1965 ) Fantasy, Horror
- Orphan ( 2009 ) Horror, Mystery, Thriller
- Otis ( 2008 ) Comedy, Horror
- Ouija ( 2014 ) Horror
- Ouija: Origin of Evil ( 2016 ) Horror, Thriller
- Out of Mind: The Stories of H.P. Lovecraft ( 1998 ) Fantasy, Horror, TV Movie
- Out of the Dark ( 1995 ) Comedy, Fantasy, Horror
- Out of the Dark ( 2014 ) Horror, Thriller
- Outer Space ( 1999 ) Horror
- Outpost ( 2007 ) Action, Adventure, Horror
- Outpost: Black Sun ( 2012 ) Action, Horror
- Outpost: Rise of the Spetsnaz ( 2013 ) Action, Horror, Science Fiction
- Over Your Dead Body ( 2014 ) Horror
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