Luettelo Windows-peleistä
O

| Nimi | Julkaistu | Kehittäjä | Julkaisija |
| --- | --- | --- | --- |
| O.D.T. | 1998 | Psygnosis | Psygnosis |
| O.R.B: Off-World Resource Base | 2002 | Strategy First | Strategy First, Mindscape |
| Oasis | 2005 | Mind Control Software | PlayFirst |
| ObsCure | 2004 | Hydravision Entertainment | DreamCatcher Interactive |
| ObsCure II | 2008 | Hydravision Entertainment | Playlogic Entertainment |
| Obsidian | 1996 | Rocket Science Games | SegaSoft |
| Oceanhorn: Monster of Uncharted Seas | 2015 | Cornfox & Bros. | FDG Entertainment |
| Oceanhorn 2: Knights of the Lost Realm | 2017 | Cornfox & Bros. | FDG Entertainment |
| Oddballz: Your Wacky Computer Petz | 1996 | PF Magic | PF Magic |
| Oddworld: Abe's Exoddus | 1998 | Oddworld Inhabitants | GT Interactive |
| Oddworld: Abe's Oddysee | 1997 | Oddworld Inhabitants | GT Interactive |
| Oddworld: New 'n' Tasty! | 2015 | Just Add Water | Oddworld Inhabitants |
| Odyssey: The Search for Ulysses | 2000 | Cryo Interactive | Cryo Interactive |
| The Office | 2009 | MumboJumbo | NBC |
| Oh No! - A Game of Chance | 1994 | Stephen R. Woods | Financial Systems Associates, Inc. |
| Oh No! More Lemmings | 1995 | DMA Design | Psygnosis |
| Oh...Sir! The Hollywood Roast | 2017 | Vile Monarch | Gambitious |
| Oh...Sir! The Insult Simulator | 2017 | Vile Monarch | Gambitious |
| Omega | 2003 |  |  |
| The Omega Stone | 2003 | Omni Creative | DreamCatcher Interactive |
| Omikron: The Nomad Soul | 1999 | Quantic Dream | Eidos Interactive |
| One Must Fall: Battlegrounds | 2003 | Diversions Entertainment | Diversions Publishing |
| One Piece: Pirate Warriors 3 | 2015 | Omega Force | Bandai Namco Entertainment |
| One Piece: Burning Blood | 2016 | Spike Chunsoft | Bandai Namco Entertainment |
| onEscapee | 1997 | Invictus Games, Ltd. | Sadeness Software |
| Oni | 2001 | Bungie | Gathering of Developers |
| Onimusha 3: Demon Siege | 2004 | Capcom | Capcom |
| Onimusha: Warlords | 2001 | Capcom | Capcom |
| Online Bomberman | 2004 | Hudson Soft, MGAME Corp. | Wizgate, Fullerton |
| Onlineworms | 2001 | Wizgate | Wizgate |
| Only If | 2014 | Creability | Creability |
| Oolite | 2006 | Giles Williams |  |
| Open Kart | 2001 | Microids | Microids |
| OpenArena | 2005 | OpenArena team |  |
| Operation Flashpoint: Cold War Crisis | 2001 | Bohemia Interactive Studio | Codemasters |
| Operation Flashpoint: Dragon Rising | 2009 | Codemasters | Codemasters |
| Operation: Blockade | 2002 | Screaming Games | Infogrames |
| Operation: Matriarchy | 2005 | MADIA Entertainment | Buka Entertainment |
| Operation Neptune | 1995 | The Learning Company | The Learning Company |
| The Operative: No One Lives Forever | 2000 | Monolith Productions | Fox Interactive |
| Oppai Slider 2 | 2005 | Illusion | Illusion |
| The Orange Box | 2007 | Valve Corporation | Valve Corporation |
| Orcs Must Die! | 2011 | Robot Entertainment |  |
| Orbiter | 2000 | Martin Schweiger |  |
| Order of War | 2009 | Wargaming.net | Square Enix |
| The Oregon Trail | 1997 | MECC | Brøderbund |
| The Oregon Trail II | 1995 | MECC | Softkey |
| The Oregon Trail 3rd Edition | 1997 | MECC | MECC |
| The Oregon Trail 4th Edition | 2001 | MECC | The Learning Company |
| Oretachi ni Tsubasa wa Nai | 2009 | Navel | Navel |
| Original War | 2001 | Altar Interactive | Virgin Interactive |
| The Orion Conspiracy | 1995 | Divide By Zero | Domark |
| Orly's Draw-A-Story | 1996 | ToeJam & Earl Productions | Broderbund |
| Osmos | 2009 | Hemisphere Games | Hemisphere Games |
| Ostrich Island | 2015 | MeDungeon Ltd. | MeDungeon Ltd. |
| OttoMatic | 2001 | Pangea Software | Aspyr Media |
| Out of the Park Baseball | 2008 | OOTP Developments | OOTP Developments |
| Outcast | 1999 | Appeal | Infogrames |
| The Outforce | 2000 | O3 Games | Pan Interactive, Strategy First |
| Outlast | 2013 | Red Barrels | Red Barrels |
| Outlast 2 | 2017 | Red Barrels | Red Barrels |
| Outlaw Golf | 2002 | Hypnotix | Global Star Software |
| Outlaws | 1997 | LucasArts | LucasArts |
| Outlive | 2001 | Continuum Entertainment | Continuum Entertainment, Take-Two Interactive |
| Outpost 2: Divided Destiny | 1997 | Dynamix | Sierra On-Line |
| Outpost Kaloki | 2004 | NinjaBee | Microsoft Game Studios |
| OutRun 2006: Coast 2 Coast | 2006 | Sumo Digital | Sega |
| Outwars | 1998 | SingleTrac | Microsoft |
| Over the Hedge | 2006 | Edge of Reality | Activision |
| Overboard! | 1997 | Psygnosis | Psygnosis |
| Overcooked | 2016 | Ghost Town Games | Team17 |
| Overclocked: A History of Violence | 2008 | House of Tales | Lighthouse Interactive |
| Overlord | 2007 | Triumph Studios | Codemasters |
| Overlord II | 2009 | Triumph Studios | Codemasters |
| Overlord: Fellowship of Evil | 2015 | Triumph Studios | Codemasters |
| Overlord: Raising Hell | 2008 | Triumph Studios | Codemasters |
| Ozzie's Science | 1995 | Digital Impact | MicroMedia Publishers Inc. |
| Ozzie's Travels Destination India | 1995 | Digital Impact | MicroMedia Publishers Inc. |
| Ozzie's Travels Destination Japan | 1995 | Digital Impact | MicroMedia Publishers Inc. |
| Ozzie's Travels Destination Mexico | 1995 | Digital Impact | MicroMedia Publishers Inc. |
| Ozzie's World | 1994 | Digital Impact | MicroMedia Publishers Inc. |