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More information about Action.
 Game Title | Publisher | Platform |
| Open Sonic the Hedgehog | | Linux, Macintosh, Windows |
| Onslaught | Hudson Entertainment, Inc. | Wii |
| Onslaught | Ballistic, Hewson Consultants Ltd., Mirrorsoft Ltd. | Amiga, Atari ST, DOS, Genesis, Xbox 360 |
| onEscapee | Invictus Games, Ltd., Sadeness Software | Amiga, iPhone, Windows |
| Onechanbara: Bikini Zombie Slayers | D3Publisher Inc., D3Publisher of America, Inc., D3Publisher of Europe Ltd. | Wii |
| Onechanbara: Bikini Samurai Squad | D3Publisher Inc., D3Publisher of America, Inc., D3Publisher of Europe Ltd. | Xbox 360 |
| Omelette Quest | | Browser, Windows |
| Off-Road Velociraptor Safari | Flashbang Studios, LLC | Browser, Windows |
| Oddworld Pack | Oddworld Inhabitants Inc. | Windows |
| Oddworld: Abe's Oddysee | GT Interactive Software Corp., Infogrames, Inc., Atari, Inc., GameBank Corp., GT Interactive Software Europe Ltd., Oddworld Inhabitants Inc., Sony Computer Entertainment America, Inc. | Android, DOS, PlayStation, PlayStation 3, PSP, PS Vita, Windows |
| Oddworld: Abe's Exoddus | GT Interactive Software Corp., Atari, Inc., GT Interactive Software Europe Ltd., Oddworld Inhabitants Inc., Riverhill Soft Inc., Sony Computer Entertainment America, Inc. | PlayStation, PlayStation 3, PSP, PS Vita, Windows |
| ObsCure: The Aftermath | 1C Company, Ignition Entertainment Ltd. USA, Playlogic Entertainment, Inc., Playlogic International N.V. | PlayStation 2, PSP, Wii, Windows |
| ObsCure | 1C Company, ak tronic Software & Services GmbH, DreamCatcher Interactive Inc., MC2 France, MC2-Microïds | PlayStation 2, Windows, Xbox |
| NyxQuest: Kindred Spirits | Agatsuma Entertainment Co., Ltd., Chillingo Ltd, Over the Top Games S.L., TopWare Interactive | iPad, iPhone, Macintosh, Wii, Windows |
| Nuclear Strike | Dice Multi Media Europe B.V., Electronic Arts, Inc., THQ Inc. | Nintendo 64, PlayStation, PlayStation 3, PSP, Windows |
| Novalogic Multiplayer Mayhem | NovaLogic, Inc. | Windows |
| N.O.V.A. | Gameloft S.A. | Android, bada, iPad, iPhone, PlayStation 3, PSP, webOS |
| Nonamed: The Remake | | Windows |
| Ninja Train | Dot Zo Games | Xbox 360 |
| Ninja Shadow | Square Enix, Inc. | Browser |
| Ninja-kun: Ashura no Shō | HAL Laboratory, Inc., Jaleco Ltd., UPL Co., Ltd | MSX, NES, Wii |
| Ninja Gaiden | Atari Corporation, Hi-Tech Expressions, Inc., Tecmo, Inc., Tecmo, Ltd. | DOS, Lynx, Wii |
| Ninja Bros. | Dot Zo Games | Xbox 360 |
| Ninja Blade | bitComposer Games GmbH, FromSoftware, Inc., Iceberg Interactive B.V., Microsoft Game Studios, ND GAMES | Windows, Xbox 360 |
| Ninja | Armor Games Inc. | Browser | |
