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Films
- Onibaba [1964] , SHINDO Kaneto
- Onibi [1996] , MOCHIZUKI Rokuro
- Onibi, le démon [1996] , MOCHIZUKI Rokuro
- Onimaru [1988] , YOSHIDA Kiju
- Onimasa [1982] , GOSHA Hideo
- Onion field (The) [1979] , BECKER Harold
- Oniromane (L') [1969] , GINET Jean-Philippe
- Onkel Toms Hütte [1965] , RADVÁNYI Géza von
- Onkel vom Meer (Der) [2000] , BLESS Marie-Louise
- Onkyo seimeitai Noiseman
- Only Angels Have Wings [1939] , HAWKS Howard
- Only Game In Town (The) [1969] , STEVENS George
- Only God Forgives [2013] , WINDING REFN Nicolas
- Only in America [1996] , MARTIN Rusty
- Only in New York [2013] , ALBULIWI Bandar , ALBULIWI Ghazi
- Only Living Boy in New York (The) [2017] , WEBB Marc
- Only Lovers Left Alive [2013] , JARMUSCH Jim
- Only one New York [1964] , GAISSEAU Pierre-Dominique
- Only the Brave [1994] , KOKKINOS Ana
- Only the lonely [1991] , COLUMBUS Chris
- Only the River Flows [2023] , WEI Shujun
- Only the Strong [1993] , LETTICH Sheldon
- Only the Strong Survive [2002] , PENNEBAKER Don Alan , HEDGEDUS Chris
- Only the Valiant [1950] , DOUGLAS Gordon
- Only two can play [1964] , GILLIAT Sidney
- Only woman (The) [1924] , OLCOTT Sidney
- Only yesterday [1933] , STAHL John M.
- Only You [1993] , JEWISON Norman
- Only You [2018] , WOOTLIFF Harry
- Onmyoji 2 [2003] , TAKITA Yojiro