# Index of Windows games (O)

This is an index of Microsoft Windows games.
This list has been split into multiple pages. Please use the Table of Contents to browse it.

## Index of Windows games

* 0–9
* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
| Title | Released | Developer | Publisher |
| 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 |
| Observation | 2019 | No Code | Devolver Digital |
| Observer | 2017 | Bloober Team | Aspyr |
| Obsidian | 1996 | Rocket Science Games | SegaSoft |
| The Occupation | 2019 | White Paper Games | Humble Bundle |
| Oceanhorn: Monster of Uncharted Seas | 2015 | Cornfox & Bros. | FDG Entertainment |
| Oceanhorn 2: Knights of the Lost Realm | 2017 | Cornfox & Bros. | FDG Entertainment |
| Octogeddon | 2018 | All Yes Good | All Yes Good |
| 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 |
| Of Orcs and Men | 2012 | Cyanide, Spiders | Focus Home Interactive |
| Off-Road Redneck Racing | 2001 | Rage Software | Interplay Entertainment |
| Offworld Trading Company | 2016 | Mohawk Games | Stardock |
| Oil Rush | 2012 | UNIGINE Company | UNIGINE Company, Iceberg Interactive |
| Old World | 2021 | Mohawk Games | Hooded Horse |
| The Omega Stone | 2003 | Omni Creative | DreamCatcher 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 |
| Onimusha 3: Demon Siege | 2004 | Capcom | Capcom |
| Onimusha: Warlords | 2001 | Capcom | Capcom |
| Only Up! | 2023 | SCKR Games | SCKR Games |
| Oolite | 2006 | Giles Williams | |
| Open Roads | 2024 | Open Roads Team | Annapurna Interactive |
| OpenArena | 2005 | OpenArena team | |
| Operation Blockade | 2002 | Screaming Games | Infogrames |
| Operation Flashpoint: Cold War Crisis | 2001 | Bohemia Interactive Studio | Codemasters |
| Operation Flashpoint: Dragon Rising | 2009 | Codemasters | Codemasters |
| Operation Neptune | 1995 | The Learning Company | The Learning Company |
| Operation: Matriarchy | 2005 | MADIA Entertainment | Buka Entertainment |
| The Operative: No One Lives Forever | 2000 | Monolith Productions | Fox Interactive |
| The Orange Box | 2007 | Valve | Valve |
| Orbiter | 2000 | Martin Schweiger | |
| Orcs Must Die! | 2011 | Robot Entertainment | Robot Entertainment |
| Order of Battle: Pacific | 2015 | The Artistocrats | Slitherine Software |
| Order of War | 2009 | Wargaming | Square Enix |
| The Oregon Trail | 1996 | MECC | Brøderbund |
| Oregon Trail II | 1995 | MECC | Softkey |
| The Oregon Trail 3rd Edition | 1997 | MECC | MECC |
| The Oregon Trail 4th Edition | 2001 | MECC | The Learning Company |
| Ori and the Blind Forest | 2015 | Moon Studios | Microsoft Studios |
| Original War | 2001 | Altar Interactive | Virgin Interactive |
| Orion: Prelude | 2014 | Spiral Game Studios | Spiral Game Studios |
| Orly's Draw-A-Story | 1997 | ToeJam & Earl Productions | Broderbund |
| Osiris: New Dawn | 2023 | Fenix Fire Entertainment | Fenix Fire Entertainment |
| Osmos | 2009 | Hemisphere Games | Hemisphere Games |
| Othercide | 2020 | Lightbulb Crew | Focus Home Interactive |
| Otto Matic | 2001 | Pangea Software | Aspyr Media |
| Out of the Park Baseball | 2008 | OOTP Developments | OOTP Developments |
| Outcast | 1999 | Appeal | Infogrames |
| Outcast: A New Beginning | 2024 | Appeal Studios | THQ Nordic |
| Outer Wilds | 2019 | Mobius Digital | Annapurna Interactive |
| The Outer Worlds | 2019 | Obsidian Entertainment | Private Division |
| The Outforce | 2000 | O3 Games | Pan Interactive, Strategy First |
| Outlast | 2013 | Red Barrels | Red Barrels |
| Outlast 2 | 2017 | Red Barrels | Red Barrels |
| The Outlast Trials | 2024 | 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 |
| Outriders | 2021 | People Can Fly | Square Enix |
| OutRun 2006: Coast 2 Coast | 2006 | Sumo Digital | Sega |
| Outward | 2019 | Nine Dots | Deep Silver |
| Outwars | 1998 | SingleTrac | Microsoft |
| Over the Hedge | 2006 | Edge of Reality | Activision |
| Overboard! | 1997 | Psygnosis | Psygnosis |
| Overclocked: A History of Violence | 2008 | House of Tales | Lighthouse Interactive |
| Overcooked | 2016 | Ghost Town Games | Team17 |
| Overload | 2018 | Revival Productions | Revival Productions |
| 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 |
| Overwatch | 2016 | Blizzard Entertainment | Blizzard Entertainment |
| Overwatch 2 | 2023 | Blizzard Entertainment | Blizzard Entertainment |