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- O Homem do FuturoReleased: 2011Director: Cláudio Torres
- O Kadhal KanmaniReleased: 2015Director: Mani Ratnam
- O panikosReleased: 1969Director: Stavros Tsiolis
- O PicassoReleased: 1985Director: Camille Coudari, Gilles Carle
- O QuatrilhoReleased: October 20, 1995Director: Fábio Barreto
- O Que RestaReleased: November 16, 2018Production companies: Buendía Estudios
- O skliros andrasReleased: 1961Director: Giannis Dalianidis
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- O strannostyakh lyubviReleased: 1936Director: Yakov Protazanov
- O Stratis parastratiseReleased: 1969Director: Kostas Karagiannis
- O striglos pou egine arnakiReleased: 1968Director: Alekos Sakellarios
- O Tempo dos LeopardosReleased: June 16, 1985Director: Zdravko Velimirović
- O thanatos tha xanarthiReleased: 1961Director: Errikos Thalassinos
- O ziliarogatosReleased: 1955Director: Giorgos Tzavellas
- O ÉbrioReleased: 1946Director: Gilda de Abreu
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- O. K., Leave It to Me, Boss...!Released: February 7, 1980Director: Petr Schulhoff
- O.C. and StiggsReleased: 1985Director: Robert Altman
- O.K. ... LalibertéReleased: 1973Director: Marcel Carrière
- O.K. ConneryReleased: 1967Director: Alberto De Martino
- O.K. GarageReleased: 1998Director: Brandon Cole
- O.S.S.Released: 1946Director: Irving Pichel
- OasisReleased: 2002Director: Lee Chang-dong
- Oasis of the ZombiesReleased: 1981Director: Jesús Franco
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- OceanWorld 3DReleased: 2009Director: Jean-Jacques Mantello
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- OctoberReleased: 2010Director: Daniel Vega Vidal, Diego Vega Vidal
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- October BabyReleased: 2011Director: Andrew Erwin, Jon Erwin
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- Oedipus RexReleased: 1967Director: Pier Paolo Pasolini
- Oedipus the KingReleased: 1968Director: Philip Saville
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- Oh, God! Book IIReleased: 1980Director: Gilbert Cates
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- On Ze BoulevardReleased: 1927Production companies: Metro-Goldwyn-Mayer
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- Once in a LifetimeReleased: 1932Director: Russell Mack
- Once in a lifetimeReleased: 1941Director: Carlos F. Borcosque
- Once in a SummerReleased: 2006Director: Joh Keun-shik
- Once in the SummerReleased: April 28, 1936Director: Igor Ilyinsky, Khanan Shmain
- Once LiedReleased: February 2, 1988Director: Vladimir Bortko
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- Once More, with Feeling!Released: 1960Director: Stanley Donen
- Once There Was a GirlReleased: December 7, 1945Director: Viktor Eisymont
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- Once to Every WomanReleased: September 6, 1920Production companies: Universal Pictures
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- Once Upon a DogReleased: 1982Director: Eduard Nazarov
- Once Upon a ForestReleased: July 15, 1993Director: Charles Grosvenor
- Once Upon a ForestReleased: 2013Director: Luc Jacquet
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- Once upon a timeReleased: June 4, 1932Director: Chaim Halachmi
- Once Upon a TimeReleased: 1933Director: Léonce Perret
- Once Upon a TimeReleased: 1944Director: Alexander Hall
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- Once Upon a Time in AmericaReleased: May 23, 1984Director: Sergio Leone
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- Once Upon a Time in China and AmericaReleased: 1997Director: Sammo Hung
- Once Upon a Time in China IIReleased: 1992Director: Tsui Hark
- Once Upon a Time in China IIIReleased: 1993Director: Tsui Hark
- Once Upon a Time in China IVReleased: 1993Director: Yuen Bun
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- One Crazy 50-year-old ManReleased: 1971Director: Kostas Karagiannis
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- One Day in AugustReleased: 2001Director: Konstantinos Giannaris
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- One DesireReleased: 1955Director: Jerry Hopper
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- One Eight SevenReleased: October 16, 1997Director: Kevin Reynolds
- One Exciting AdventureReleased: September 1934Director: Ernst L. Frank
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- One Exciting NightReleased: 1922Director: D. W. Griffith
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- One Fine Spring DayReleased: 2001Director: Hur Jin-ho
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- One for the RoadReleased: 2009Director: Philippe Godeau
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- One Good TurnReleased: 1935Director: Charley Rogers
- One Good TurnReleased: 1955Director: John Paddy Carstairs
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- One Man's JourneyReleased: 1933Director: John S. Robertson
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- One Missed Call 2Released: 2005Director: Renpei Tsukamoto
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- One of ManyReleased: 1917Director: Christy Cabanne
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- One Step to DeathReleased: 1961Director: Samuel Khachikian
- One Stolen NightReleased: 1929Production companies: Warner Bros. Entertainment
- One Stolen NightReleased: 1923Production companies: Vitagraph Studios
- One Street Organ, One LifeReleased: 1958Director: Sokrates Kapsaskis
- One Summer's DayReleased: 1917Production companies: British Actors Film Company
- One Sunday AfternoonReleased: 1933Director: Stephen Roberts
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- One Thousand DollarsReleased: 1918Production companies: Vitagraph Studios
- One Ticket, Two MoviesReleased: 1990Director: Dariush Farhang
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- One True LoveReleased: 1982Director: Mark Osepyan
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- One Way PassageReleased: October 22, 1932Director: Tay Garnett
- One Way PendulumReleased: 1964Director: Peter Yates
- One Way StreetReleased: 1950Director: Hugo Fregonese
- One Way StreetReleased: 1925Director: John Francis Dillon
- One Way TicketReleased: 1935Director: Herbert Biberman
- One Wild OatReleased: 1951Director: Jack Buchanan, Charles Saunders
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- One Wonderful NightReleased: 1914Production companies: Essanay Studios
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- One Year, One NightReleased: February 14, 2022Director: Isaki Lacuesta
- One, But a Lion!Released: August 15, 1941Director: Gustaf Molander
- One, Two, ThreeReleased: 1961Director: Billy Wilder
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- One-Hand ClappingReleased: August 17, 2001Production companies: Zentropa