- Of Gods and Men ( 2010 ) Drama, History
- Of Time and the City ( 2008 ) Documentary, History
- Old Fashioned: The Story of the Wisconsin Supper Club ( 2015 ) Documentary, History
- Old Ironsides ( 1926 ) Drama, History
- Old San Francisco ( 1927 ) Drama, History, Romance
- Olga ( 2004 ) Drama, Foreign, History
- Once My Mother ( 2014 ) Documentary, Family, History, War
- One Hundred and One Nights ( 1995 ) Comedy, History, Romance
- One Man's Hero ( 1999 ) Action, Drama, History, Western
- Ong Bak 3 ( 2010 ) Action, Adventure, History
- Operation Chromite ( 2016 ) Action, Drama, History, War
- Operator 13 ( 1934 ) Drama, History, Romance, War, Western
- Orders ( 1974 ) Drama, History
- Orders to Kill ( 1958 ) Action, Drama, History
- Orphans of the Storm ( 1921 ) Drama, History
- Otaku ( 1994 ) Documentary, History
- Our Music ( 2004 ) Drama, History
- Out of the Blue ( 2002 ) Documentary, History
- Outside the Law ( 2010 ) Action, Drama, History, War
- Overlord ( 1975 ) Drama, History, War
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