| O Ano em que Meus Pais Saíram de Férias | Cao Hamburger | film beranjak dewasa, film drama | Brasil |
| O atsidas | Giannis Dalianidis | film komedi | Yunani |
| O gamos tis koris mou | Nikos Koutelidakis | film komedi | Yunani |
| O Quatrilho | Fábio Barreto | film percintaan, film drama | Brasil |
| O Sport, You Are Peace! | Boris Rychkov, Yuri Ozerov (sutradara) | film olahraga, Film dokumenter | Uni Soviet |
| O Stratis parastratise | Kostas Karagiannis | film komedi | Yunani |
| O.C. and Stiggs | Robert Altman | film remaja | Amerika Serikat |
| Oasis | Lee Chang-dong | film percintaan, film drama | Korea Selatan |
| Oath of Silence | Iraj Ghaderi | — | Iran |
| Oath-Bound | Bernard Durning | — | — |
| Oatsurae Jirokichi Koshi | Daisuke Itō | — | — |
| Obaba | Montxo Armendáriz | film drama | Jerman, Spanyol |
| Objection | Andrzej Trzos-Rastawiecki | — | Polandia |
| Objection | Erik Løchen | film drama | Norwegia |
| Obscene temptation of wife | Lee Ji-eun | — | Korea Selatan |
| Observe and Report | Jody Hill | film drama, film komedi, film kejahatan | Amerika Serikat |
| Obsessed | Steve Shill | film drama, film cerita seru | Amerika Serikat |
| Obsession | Brian De Palma | film drama kriminal, film misteri, film drama, film kejahatan menegangkan, neo-noir, film cerita seru, film kejahatan | Amerika Serikat |
| Ocean Waves | Tomomi Mochizuki | film percintaan | Jepang |
| Ocean's Eight | Gary Ross | film komedi, film laga, film cerita seru, Film perampokan, film kejahatan | Amerika Serikat |
| OceanWorld 3D | Jean-Jacques Mantello | Film dokumenter alam | Britania Raya |
| October Baby | Andrew Erwin, Jon Erwin | film drama | Amerika Serikat |
| October Days | Sergei Vasilyev | — | — |
| Octobre | Pierre Falardeau | film drama | Kanada |
| Oczy uroczne | Piotr Szulkin | film horor | Polandia |
| Oddity | Damian McCarthy | film horor, film cerita seru, Film supernatural | Republik Irlandia |
| Odds Against Tomorrow | Robert Wise | film drama, Film noir, Film perampokan, film kejahatan | Amerika Serikat |
| Ode to My Father | Yoon Je-kyoon | film drama | Korea Selatan |
| Odessa | Valery Todorovsky | film drama | Rusia |
| Odette | Giuseppe de Liguoro | — | — |
| Of Human Bondage | Ken Hughes, Henry Hathaway, Bryan Forbes | film drama | Britania Raya |
| Of Human Bondage | John Cromwell | film drama | Amerika Serikat |
| Of Human Bondage (film 1946) | Edmund Goulding | film drama | Amerika Serikat |
| Of Mice and Men | Gary Sinise | film drama, drama sejarah | Amerika Serikat |
| Off the Record | James Flood | film drama | Amerika Serikat |
| Office Romance | Ol Parker | Film komedi romantis | Amerika Serikat |
| Office Romance | Eldar Ryazanov | film drama, film komedi romantis | Uni Soviet |
| Officers | Vladimir Rogovoy | film percintaan, film drama, film perang | Uni Soviet |
| Officetel - Skillful Ones | Chun Sung-joon | — | Korea Selatan |
| Official Competition | Mariano Cohn, Gastón Duprat | film komedi | Spanyol, Argentina |
| Official the Silence of the Lambs Parody | Gary Dean Orona | film misteri, film komedi, film horor, film cerita seru, film kejahatan | Amerika Serikat |
| Offline Mode | Fausto Brizzi | film komedi | Italia |
| Ogaryova Street, Number 6 | Boris Grigoryev | film kejahatan | Uni Soviet |
| Oh My School! | — | film animasi | Tiongkok |
| Oh! What a Family | Wang Haowei | film komedi | Tiongkok |
| Oh, Serafina! | Alberto Lattuada | film komedi | Italia |
| Oh, Susanna! | Smiley Burnette, Nat Levine, Gene Autry, Joseph Kane, Oliver Drake | Barat | Amerika Serikat |
| Oi paranomoi | Nikos Koundouros | film drama | Yunani |
| Ojōsan shachō | Kō Nakahira | — | — |
| Okanjuwa | — | — | Nigeria |
| OKI - In the Middle of the Ocean | Māris Martinsons | film misteri, film drama | Latvia, Amerika Serikat |
| Okinawa Rendez-vous | Gordon Chan | film komedi romantis | Hong Kong |
| Okka Kshanam | Vi Anand | film percintaan, film cerita seru, Film fiksi ilmiah | India |
| Oklahoma Annie | R. G. Springsteen | Barat | Amerika Serikat |
| Oklahoma Blues | Lambert Hillyer | — | — |
| Ola & Julia | Jan Halldoff | film drama | Swedia |
| Old Barge, Young Love | Hans Heinrich | — | — |
| Old Dogs | Walt Becker | film komedi | Amerika Serikat |
| Old Heidelberg | Hans Behrendt | — | — |
| Old Khottabych | Gennady Kazansky | — | — |
| Old Letters | Anatolii Ivanov | film drama | Uni Soviet |
| Old Mother Riley in Business | John Baxter | — | — |
| Old Overland Trail | William Witney | Barat | Amerika Serikat |
| Old Well | Wu Tianming | film drama romantis | Tiongkok |
| Old White Man | Simon Verhoeven | film komedi | Jerman |
| Old-fashioned Tango | Alexander Belinsky, Dmitry Bryantsev | film komedi, film musikal | Uni Soviet |
| Oldboy (film 2013) | Spike Lee | film misteri, film drama, film kejahatan | Amerika Serikat |
| Oleksa Dovbush | Viktor Ivanov | — | Uni Soviet |
| Oli Vilakku | Tapi Chanakya | film kejahatan | India |
| Oliver & Company | George Scribner | film keluarga, film anak-anak, film petualangan, film musikal, drama komedi | Amerika Serikat |
| Oliver Twist, Jr. | Millard Webb | — | — |
| Olle Hexe | Günter Meyer | film anak-anak | Jerman |
| Olli’s Apprenticeship | Teuvo Puro | — | — |
| Olsen Gang jr. Master Thief tax | Arne Lindtner Næss | film komedi | Norwegia |
| Olsenbanden tar gull | Knut Bohwim | film komedi kriminal | Norwegia |
| Olsenbandens siste bedrifter | Knut Andersen | film komedi kriminal | Norwegia |
| Olympus Inferno | Igor Voloshin | film drama, film laga, film perang | Rusia |
| Om Shanti Om | Farah Khan | film percintaan, film fantasi | India |
| Omar Khayyam | William Dieterle | Film biografi | Amerika Serikat |
| Ome Cor | Peter Verhage, Martin van Waardenberg | film komedi | Belanda |
| Omega, Omega | Gervasio Iglesias Macías | Film dokumenter | Spanyol |
| Omena putoaa... | Valentin Vaala | — | — |
| Omertà | Luc Dionne | film cerita seru | Kanada |
| OMG | — | film komedi romantis | Filipina |
| Omkara | Vishal Bhardwaj | film drama | India |
| Omok Girl | — | film drama | Korea Selatan |
| On a Clear Day You Can See Forever | Vincente Minnelli | Film komedi romantis, film drama, film fantasi, film musikal, drama komedi | Amerika Serikat |
| On Approval | Clive Brook | — | — |
| On Dangerous Paths | John H. Collins | — | — |
| On Guard | Philippe de Broca | film petualangan | Prancis, Jerman, Italia |
| On Her Majesty's Secret Service | Peter R. Hunt | film laga, film mata-mata, film cerita seru, film petualangan, film kejahatan | Britania Raya |
| On Her Wedding Night | George D. Baker | — | — |
| On Our Merry Way | Leslie Fenton, King Vidor | film komedi | Amerika Serikat |
| On Our Selection | Ken G. Hall | — | — |
| On Secret Service | Arthur B. Woods | — | — |
| On Set With Riley Reid | — | — | Amerika Serikat |
| On the Air | Herbert Smith | film musikal | Britania Raya |
| On the day of the holiday | Pyotr Todorovsky | film drama | Uni Soviet |
| On the Loose | Hal Roach | film komedi | Amerika Serikat |
| On the Red Front | Lev Kuleshov | — | — |
| On the road to Hollywood | Aleksey Garnizov | musik pop | Amerika Serikat |
| On the Steppe | Boriss Bunejev | — | — |
| On the Top of the Cherry Tree | Mariana Evstatieva-Biolcheva | film drama, drama komedi | Republik Rakyat Bulgaria |
| On the Waterfront | Elia Kazan | film drama, film cerita seru, film kejahatan | Amerika Serikat |
| On the Way to Berlin | Mikhail Yershov | film perang | Uni Soviet |
| On the Wings of Dreams | Golam Rabbany Biplob | film drama | Bangladesh |
| On Thin Ice | Damir Vyatich-Berezhnykh | film mata-mata, film petualangan, film perang | Uni Soviet |
| On Tour | Mathieu Amalric | film drama, film komedi | Prancis, Jepang, Jerman, Amerika Serikat, Korea Selatan |
| On Trial | Archie Mayo | — | — |
| On Trial | W. S. Van Dyke | — | — |
| On Wings of Love | Toshio Sugie | — | — |
| Once a Cop | Stanley Tong | film seni bela diri, film laga, film cerita seru | Hong Kong |
| Once Bitten | Howard Storm | film komedi, Horor komedi | Amerika Serikat |
| Once in a Summer | Joh Keun-shik | film drama | Korea Selatan |
| Once in the Summer | Igor Ilyinsky, Khanan Shmain | film komedi | Uni Soviet |
| Once Lied | Vladimir Bortko | film percintaan, film drama | Uni Soviet |
| Once There Was a Girl | Viktor Eisymont | — | — |
| Once Upon a Crime | Yūichi Fukuda | film misteri, film fantasi, film komedi, film petualangan, film kejahatan | Jepang |
| Once Upon a Honeymoon | Leo McCarey | drama komedi, film komedi romantis | Amerika Serikat |
| Once Upon a Horse... | Hal Kanter | Barat | Amerika Serikat |
| Once Upon a Time in a Battlefield | Lee Joon-ik | film drama, film perang | Korea Selatan |
| Once Upon a Time in China | Tsui Hark | film seni bela diri, film laga, Film biografi | Hong Kong |
| Once Upon a Time in China II | Tsui Hark | film seni bela diri, film laga, Film biografi | Hong Kong |
| Once Upon a Time in China IV | Yuen Bun | film seni bela diri, Film biografi | Hong Kong |
| Once Upon a Time in Hollywood | Quentin Tarantino | film drama, film komedi, sejarah alternatif, drama komedi, film kejahatan | Britania Raya, Amerika Serikat |
| Once Upon a Time in Mesopotamia | Jean-Claude Lubtchansky | Film dokumenter | Prancis |
| Once Upon a Time in the West | Sergio Leone | film drama, Barat, film laga, Koboi Italia, film kolosal | Amerika Serikat, Italia |
| Once Upon a Time Twenty Years Later | Yuri Yegorov | drama komedi | Uni Soviet |
| Once Upon a Time: Beirut | Jocelyne Saab | — | Prancis, Jerman |
| Once Upon an Angel | Vincent Perez | film percintaan, film drama | Prancis |
| Once Upon My Mother | Ken Scott | film komedi, drama komedi | Prancis, Kanada |
| Once You Give Away Your Heart | Johannes Guter | — | — |
| One and Eight | Zhang Junzhao | film perang | Tiongkok |
| One Angry Vegan | Gil Golan | Film dokumenter | Israel |
| One Crazy 50-year-old Man | Kostas Karagiannis | film komedi | Yunani |
| One Eight Seven | Kevin Reynolds | film drama, film cerita seru, film kejahatan | Amerika Serikat |
| One Exciting Night | Walter Forde | — | — |
| One Fine Day | — | film drama | Indonesia |
| One Fine Day | Michael Hoffman | film komedi romantis | Amerika Serikat |
| One for the Road | Philippe Godeau | film drama | Prancis |
| One for the Road | Paul Trijbits | drama komedi | Britania Raya |
| One Good Turn | Arthur Maude | film komedi | Britania Raya |
| One Ham's Family | Tex Avery | film keluarga, film komedi | Amerika Serikat |
| One Heavenly Night | George Fitzmaurice | — | — |
| One Hundred Days After Childhood | Sergei Solovyov | film percintaan, film remaja, film drama | Uni Soviet |
| One Hundred Steps | Marco Tullio Giordana | film drama, Film biografi | Italia |
| One in a Million | Sidney Lanfield | film musikal, film komedi romantis | Amerika Serikat |
| One in the Chamber | William Kaufman | film laga | Amerika Serikat |
| One Man Band | Mark Andrews, Andrew Jimenez | film keluarga, film komedi, film musikal | Amerika Serikat |
| One Mile from Heaven | Allan Dwan | film drama | Amerika Serikat |
| One Minute to Zero | Tay Garnett | — | — |
| One More River | James Whale | — | — |
| One Night | — | — | — |
| One Night in the Tropics | A. Edward Sutherland | film komedi, film musikal | Amerika Serikat |
| One Night of Love | Victor Schertzinger | film musikal | Amerika Serikat |
| One Night Stand | Mike Figgis | film percintaan, film drama | Amerika Serikat |
| One Nite in Mongkok | Derek Yee | film drama, film kejahatan | Hong Kong |
| One of Our Dinosaurs Is Missing | Robert Stevenson | film komedi, neo-noir | Britania Raya, Amerika Serikat |
| One of the People | Dejidiin Jigjid | — | Republik Rakyat Mongolia |
| One Piece | Junji Shimizu | anime dan manga laga, anime dan manga fantasi, anime dan manga petualangan | Jepang |
| One Piece Film: Red | Gorō Taniguchi | film fantasi, film komedi, film laga, film petualangan | Jepang |
| One Piece The Movie: Dead End no Bōken | Kōnosuke Uda | film komedi, film laga, film petualangan | Jepang |
| One Piece: Baron Omatsuri and the Secret Island | Mamoru Hosoda | film komedi, film laga, film horor, film cerita seru, film petualangan | Jepang |
| One Piece: The Cursed Holy Sword | Kazuhisa Takenouchi | film komedi, film laga, film petualangan | Jepang |
| One Saturday Evening | Erik Balling | film keluarga | Denmark |
| One Silver Piece | Jaroslav Balík | film drama | Cekoslowakia |
| One Swallow Does Not Make a Summer | Hasse Ekman | film komedi | Swedia |
| One Thing She Doesn't Have | — | film percintaan | Korea Selatan |
| One Ticket, Two Movies | Dariush Farhang | film drama, film komedi | Iran |
| One Touch of Sin | Richard Stanton | — | — |
| One True Love | Mark Osepyan | film drama | Uni Soviet |
| One True Thing | Carl Franklin | film drama | Amerika Serikat |
| One Way Passage | Tay Garnett | — | — |
| One Way Pendulum | Peter Yates | film komedi | Britania Raya |
| One Way Ticket | Herbert Biberman | film drama | Amerika Serikat |
| One Wonderful Sunday | Akira Kurosawa | film percintaan, film drama | Jepang |
| One, But a Lion! | Gustaf Molander | film komedi romantis | Swedia |
| Only Clouds Move the Stars | Torun Lian | film drama, film keluarga | Norwegia |
| Only God Sees Me | Bruno Podalydès | film komedi | Prancis |
| Only Lovers Left Alive | Jim Jarmusch | film percintaan, film drama, film musikal | Prancis, Britania Raya, Jerman, Siprus |
| Only the Strong | Sheldon Lettich | film beranjak dewasa, film seni bela diri, film laga | Amerika Serikat |
| Only When I Larf | Basil Dearden | film komedi | Britania Raya |
| Only When I Laugh | Glenn Jordan | drama komedi | Amerika Serikat |
| Only Yesterday | Isao Takahata | film beranjak dewasa, film drama, film anime | Jepang |
| Only Yesterday | John M. Stahl | film drama | Amerika Serikat |
| Onnenpotku | Glory Leppänen | film komedi romantis | Finlandia |
| Onnu Muthal Poojyam Vare | Raghunath Paleri | film drama | India |
| Onoda | Arthur Harari | film drama biografi, film drama, film petualangan, film perang | Prancis, Jepang, Jerman, Belgia, Italia, Kamboja |
| Onward Christian Soldiers | Rex Wilson | — | — |
| Ooh… You Are Awful | Cliff Owen | Film independen | Britania Raya |
| Ooyala | S. V. Krishna Reddy | — | India |
| Op Hoop van Zegen | Alex Benno, Louis Saalborn | film drama | Belanda |
| Opa Cor | Peter Verhage, Martin van Waardenberg | film komedi | Belanda |
| Open Hearts | Susanne Bier | film percintaan, film drama | Denmark |
| Open Season 2 | Matthew O'Callaghan, Todd Wilderman | film keluarga, film komedi | Amerika Serikat |
| Opera Ball | Ernst Marischka | film musikal | Austria |
| Operasjon Løvsprett | Knut Andersen | film komedi | Norwegia |
| Operasjon Sjøsprøyt | Knut Bohwim | film komedi | Norwegia |
| Operation Daybreak | Lewis Gilbert | film drama, film petualangan, film perang | Amerika Serikat, Cekoslowakia, Yugoslavia |
| Operation Pacific | George Waggner | film perang | Amerika Serikat |
| Ophelia will arrive a bit later | Lou Scamble, Charles Massicote | fiksi | Kanada |
| Oppam | Priyadarshan | film kejahatan menegangkan | India |
| Opposites Attract | Max Croci | film komedi | Italia |
| Opticheskie perekladki | Vladimir Nikitchenko | — | — |
| Optimisticheskaya tragediya | Samson Samsonov | film drama, film perang | Uni Soviet |
| Or | Keren Yedaya | film drama | Prancis, Israel |
| Orang Kaya Baru | Ody C. Harahap | — | Indonesia |
| Orange | Kōjirō Hashimoto | film drama | Jepang |
| Orange County | Jake Kasdan | film beranjak dewasa, film remaja, film komedi | Amerika Serikat |
| Orca (1977) | Michael Anderson | film horor, film cerita seru, film petualangan, Film independen, Film bencana | Italia, Belanda |
| Orchids and Ermine | Alfred Santell | — | — |
| Ordinary Angels (film) | Jon Gunn | film drama | Amerika Serikat |
| Organ Child | Chieh Shueh-bin | film cerita seru, film kejahatan | Taiwan |
| Oridu Hallan | Said Marzouk | film drama | Mesir |
| Orient Express | Wilhelm Thiele | — | — |
| Orient Express | Victor Tourjansky | — | — |
| Orisa | Odunlade Jonathan Adekola | film drama | Nigeria |
| Orisun | — | — | Nigeria |
| Orlando | Sally Potter | film drama, film fantasi | Prancis, Britania Raya, Rusia, Italia, Belanda |
| Orphan | Jaume Collet-Serra | film misteri, film drama, film horor, film cerita seru | Prancis, Kanada, Jerman, Amerika Serikat |
| Orpheus in der Unterwelt | — | — | — |
| Orpopojan valssi | Ville Salminen | Film biografi | Finlandia |
| Oru Sundariyude Katha | Thoppil Bhasi | — | India |
| Oryu's Passion: Bondage Skin | — | Film pink | Jepang |
| Osmanlı Kartalı | Osman F. Seden | — | Turki |
| Osmondagi bolalar 2 | Zulfikar Musakov | — | Uzbekistan |
| Osobykh primet net | Anatoly Bobrovsky | film drama | Uni Soviet, Republik Rakyat Polandia |
| Oss atomforskere i mellom | Titus Vibe-Müller | film komedi kriminal | Norwegia |
| Ostrva | Jovan Zivanović | film percintaan, film drama | Jerman, Yugoslavia |
| Oswald. The Minsk Mystery | Viktor Aslyuk | Film dokumenter | Belarus |
| Otaraant Kvrivi | Mikheil Chiaureli | — | — |
| Other Men's Daughters | Carl Harbaugh | — | — |
| Other People's Children | Tengiz Abuladze | film drama | Republik Sosialis Soviet Georgia |
| Otryad | Aleksei Simonov | film drama, film perang | Uni Soviet |
| Otôsan no backdrop | Toshio Lee | film drama, film komedi | Jepang |
| Our Agent Tiger | Claude Chabrol | film misteri, film komedi, film mata-mata, film petualangan, film kejahatan | Prancis, Spanyol, Italia |
| Our Enemy — The Japanese | — | — | — |
| Our Fantastic 21st Century | Ryu Hyung-ki | film drama | Korea Selatan |
| Our Father... | Veikko Aaltonen | film drama | Finlandia |
| Our Lips Are Sealed | Craig Shapiro | film komedi | Amerika Serikat |
| Our Little Sister | Hirokazu Koreeda | film drama, film keluarga | Jepang |
| Our Love Story | Lee Hyun-ju | film drama | Korea Selatan |
| Our Man Flint | Daniel Mann | Film fiksi ilmiah, Film parodi | Amerika Serikat |
| Our Man in Havana | Carol Reed | film drama, film mata-mata | Britania Raya, Amerika Serikat |
| Our Miss Fred | Bob Kellett | — | Britania Raya |
| Our Song | Erdenebatyn Oyun | — | Republik Rakyat Mongolia |
| Our Vines Have Tender Grapes | Roy Rowland | — | — |
| Our War | Bernard-Henri Lévy, Marc Roussel | Film dokumenter | Prancis |
| Our Wife | John M. Stahl | film komedi | Amerika Serikat |
| Out Cold | Emmett Malloy, Brendan Malloy | film komedi, film laga | Amerika Serikat |
| Out of a Clear Sky | Marshall Neilan | — | — |
| Out Of Our System | Dan Humes, Rhiannon Humes, Seth Gamble | film drama, film porno | Kanada |
| Out of Sight | Steven Soderbergh | Film komedi romantis, film laga, Film perampokan, Film penjara, film kejahatan | Amerika Serikat |
| Outdoors | Asaf Saban | film drama | Israel |
| Outlaw Blues | Richard T. Heffron | film drama | Amerika Serikat |
| Outlaws | Daniel Monzón | film cerita seru | Spanyol |
| Outlaws of Sonora | George Sherman | — | — |
| Outside the Wall | Crane Wilbur | film drama, Film noir, film kejahatan | Amerika Serikat |
| Outside These Walls | Ray McCarey | — | — |
| Over 90 and Loving It | Susan Polis Schutz | Film dokumenter | Amerika Serikat |
| Over the Hill | Henry King | film drama | Amerika Serikat |
| Over the Moon (film) | Thornton Freeland | — | — |
| Overcomer (film) | Alex Kendrick | film drama | Amerika Serikat |
| Overexposed | Larry Brand | film cerita seru | Amerika Serikat |
| Overland Stage Raiders | George Sherman | Barat | Amerika Serikat |
| Overland with Kit Carson | Norman Deming | — | — |
| Owe akala | S.O.B Agunbiade | — | Nigeria |
| Owuro lojo | Kayode Adegbie | — | Nigeria |
| Oyayubi Sagashi | Naoto Kumazawa | — | Jepang |
| Ozzy | Alberto Rodríguez Librero | film petualangan | Kanada, Spanyol |
| Où êtes-vous donc? | Gilles Groulx | — | Kanada |
| Oʻtgan kunlar | Yoʻldosh Aʼzamov | film drama | Uni Soviet |
| Ölüm Fermanı | Kemal Kan, Mohammad Motevaselani | film komedi, Barat, film petualangan | Turki, Iran |
| Ōoku Maruhi Monogatari | Sadao Nakajima | — | Jepang |
| Ōshō | Daisuke Itō | film drama | Jepang |