- O Amor Natural ( 1996 ) Documentary
- O.J.: Made in America ( 2016 ) Documentary
- Obit ( 2017 ) Documentary
- Objectified ( 2009 ) Documentary
- Oblivion ( 2008 ) Documentary
- Obsession: Radical Islam's War Against the West ( 2005 ) Documentary
- OC87: The Obsessive Compulsive, Major Depression, Bipolar, Asperger's Movie ( 2012 ) Documentary
- Occupation 101 ( 2006 ) Documentary
- Occupy Love ( 2013 ) Documentary, Drama
- Oceans ( 2009 ) Documentary, Family
- OceanWorld 3D ( 2009 ) Documentary
- October Country ( 2009 ) Documentary
- October (Ten Days that Shook the World) ( 1928 ) Documentary, Drama
- Oddsac ( 2010 ) Documentary, Music
- Odyssey in Rome ( 2005 ) Documentary
- Of Men and War ( 2014 ) Documentary
- Of Time and the City ( 2008 ) Documentary, History
- Of Two Minds ( 2012 ) Documentary
- Off and Running ( 2009 ) Documentary
- Off the Charts: The Song-Poem Story ( 2003 ) Documentary
- Off the Menu: The Last Days of Chasen's ( 1998 ) Documentary
- Official Rejection ( 2009 ) Comedy, Documentary
- Oh My God ( 2009 ) Comedy, Documentary
- Oil City Confidential ( 2009 ) Documentary, Music
- Okie Noodling ( 2001 ) Documentary
- Oklahoma City ( 2017 ) Documentary
- Old Fashioned: The Story of the Wisconsin Supper Club ( 2015 ) Documentary, History
- Old Partner ( 2008 ) Documentary
- Olmo & the Seagull ( 2015 ) Documentary, Drama
- Olympia Part One: Festival of the Nations ( 1938 ) Documentary
- Olympia Part Two: Festival of Beauty ( 1938 ) Documentary
- On Any Sunday ( 1971 ) Documentary
- On Any Sunday, The Next Chapter ( 2014 ) Documentary
- On Football ( 2016 ) Documentary, Drama
- On the Bowery ( 1957 ) Documentary
- On the Rumba River ( 2007 ) Documentary
- On the Way to School ( 2013 ) Documentary
- Once Brothers ( 2010 ) Documentary
- Once in a Lifetime: The Extraordinary Story of the New York Cosmos ( 2006 ) Documentary
- Once My Mother ( 2014 ) Documentary, Family, History, War
- One Bright Shining Moment ( 2005 ) Documentary
- One Day in September ( 1999 ) Documentary
- One Day Since Yesterday: Peter Bogdanovich & the Lost American Film ( 2014 ) Documentary
- One Direction: This Is Us ( 2013 ) Documentary, Music
- One Last Hug ( 2014 ) Documentary
- One Life ( 2011 ) Documentary, Family
- One Little Pill ( 2014 ) Documentary, Drama
- One Lucky Elephant ( 2011 ) Documentary
- One Mile Away ( 2013 ) Documentary
- One More Time with Feeling ( 2016 ) Documentary, Music
- One Nine Nine Four ( 2009 ) Documentary, Music
- One Rogue Reporter ( 2014 ) Comedy, Documentary
- One Six Right ( 2005 ) Documentary
- One Survivor Remembers ( 1996 ) Documentary
- One Track Heart: The Story of Krishna Das ( 2013 ) Documentary, Music
- One Way or Another ( 1978 ) Documentary, Drama
- Only the Dead See The End of War ( 2015 ) Documentary
- Only the Strong Survive ( 2002 ) Documentary, Music
- Only the Young ( 2012 ) Comedy, Documentary, Romance
- Open Heart ( 2013 ) Documentary
- Operation Homecoming: Writing the Wartime Experience ( 2007 ) Documentary
- Orange Sunshine ( 2016 ) Documentary
- Orania ( 2013 ) Documentary
- Orgasm Inc. ( 2009 ) Documentary
- Orson Welles: Shadows & Light ( 2015 ) Documentary
- Orson Welles: The One-Man Band ( 1995 ) Documentary
- Orwell Rolls in His Grave ( 2003 ) Documentary
- OT: Our Town ( 2002 ) Documentary
- Otaku ( 1994 ) Documentary, History
- Other Worlds ( 2004 ) Documentary
- Our City Dreams ( 2008 ) Documentary
- Our Curse ( 2013 ) Documentary
- Our Daily Bread ( 2006 ) Documentary, Foreign
- Our Last Tango ( 2015 ) Documentary
- Our Man in Tehran ( 2013 ) Documentary
- Our Nixon ( 2013 ) Documentary
- Our Trip to Africa ( 1966 ) Documentary
- Our Vinyl Weighs a Ton: This Is Stones Throw Records ( 2013 ) Documentary, Music
- Out of the Blue ( 2002 ) Documentary, History
- Out Of The Clear Blue Sky ( 2012 ) Documentary
- Outfoxed: Rupert Murdoch's War on Journalism ( 2004 ) Documentary
- Outrage ( 2009 ) Documentary
- Overnight ( 2003 ) Documentary
- Owen Hart of Gold ( 2015 ) Documentary
- Owned & Operated ( 2012 ) Documentary
- Oxyana ( 2013 ) Documentary
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