| title | developer | year | platform | | pop. |
|---|
| One More Night | Big Red Planet | 2016 | Linux | strategy | | | label | |
| One-Eyed Lee and the Dinner Party | DarkChibiShadow | 2019 | Linux | adventure Fantasy | | | label | |
| Onechanbara: Bikini Samurai Squad | Tamsoft | 2006 | X360 | beat 'em up | image | subject | label | |
| Onechanbara: Bikini Zombie Slayers | Tamsoft | 2008 | Wii | action/reflex | image | | label | |
| OpenDungeons | Open Dungeons Community | 2009 | Linux | strategy | | subject | label | |
| OpenDungeons | Open Dungeons Community | ? | BSD | strategy | | | label | |
| OpenDungeons | Open Dungeons Community | ? | BSD | strategy | | | label | |
| OpenQuartz | Open Quartz Team | 2001 | Linux | shooter | | subject | label | |
| OpenQuartz | Open Quartz Team | ? | BeOS | shooter | | | label | |
| Operencia: The Stolen Sun | Zen Studios | 2018 | Windows | role-play turn-based Fantasy | | | label | |
| Orcs Must Die! | Robot Entertainment | 2011 | Windows | action/reflex strategy Fantasy | image | subject | label | |
| Orcs Must Die! | Robot Entertainment | 2014 | Linux | action/reflex strategy Fantasy | | | label | |
| Orcs Must Die! 2 | Robot Entertainment | 2012 | Windows | action/reflex Fantasy | image | subject | label | |
| Orcs Must Die! 2 | Robot Entertainment | 2014 | Linux | action/reflex Fantasy | | | label | |
| Organ Trail: Complete Edition | The Men Who Wear Many Hats | 2015 | PS Vita | shooter | image | | label | |
| Organ Trail: Director's Cut | Hats Productions | 2012 | Linux | shooter | image | | label | |
| ORiGiN | author | 2007 | Linux | action/reflex adventure Fantasy | image | subject | label | |
| OS2Moria | author | 1992 | OS/2 | role-play Fantasy | | | label | |
| Overlord | Triumph Studios | 2007 | Windows | action/reflex adventure Fantasy | image | subject | label | |
| Overlord | Triumph Studios | 2007 | X360 | action/reflex adventure Fantasy | image | | label | |
| Overlord | Triumph Studios | 2007 | Linux | action/reflex adventure Fantasy | | | label | |
| Overlord: Raising Hell | Triumph Studios | 2008 | PS3 | action/reflex adventure Fantasy | image | | label | |
| Overlord: Raising Hell | Triumph Studios;Virtual Programming | 2016 | Linux | action/reflex adventure Fantasy | | | label | |
| Painkiller | People Can Fly | 2004 | Windows | shooter Fantasy | image | | label | |
| Path of Exile | Grinding Gear Games | 2013 | Windows | action/reflex role-play Fantasy | image | subject | label | |
| Path of Shadows | author | 2012 | Linux | role-play Fantasy | image | | label | |
| Pathways Into Darkness | Bungie Software Products Corporation | 1993 | Mac OS Classic | action/reflex shooter puzzle role-play Fantasy | image | | label | |
| phantasia | author | 1993 | Linux | role-play | image | subject | label | |
| phantasia | author | 2003 | BSD | role-play | | | label | |
| Phantasie | Logical Design Works | 1986 | Atari ST | role-play Fantasy | image | | label | |
| Phantasie | Logical Design Works | 1987 | MS-DOS | role-play Fantasy | image | | label | |
| Phantasie | Logical Design Works | 1987 | Atari 400/800 | role-play Fantasy | image | | label | |
| Phantasie | Andromeda Software | 1987 | Amiga | role-play Fantasy | image | | label | |
| Phantasie | Logical Design Works | 1985 | C64 | role-play Fantasy | image | | label | |
| Phantasie | Bothtec | 1988 | MSX2 | role-play Fantasy | image | | label | |
| Phantasie | Logical Design Works | 1985 | Apple II E | role-play Fantasy | image | | label | |
| Phantasie | Starcraft | 1987 | Sharp X1 | role-play Fantasy | image | | label | |
| Phantasie | Starcraft | 1986 | NEC PC8801 | role-play Fantasy | image | | label | |
| Phantasie | Starcraft | 1986 | NEC PC9801 | role-play Fantasy | image | | label | |
| Phantasie | Starcraft | 1986 | MICRO 7 - FM7 | role-play Fantasy | | | label | |
| Phantasie II | Logical Design Works | 1986 | C64 | role-play Fantasy | image | | label | |
| Phantasie II | Logical Design Works | 1986 | Atari ST | role-play Fantasy | image | | label | |
| Phantasie II | Logical Design Works | 1987 | Atari 400/800 | role-play Fantasy | image | | label | |
| Phantasie II | Bothtec | 1988 | MSX2 | role-play Fantasy | image | | label | |
| Phantasie II | Starcraft | 1987 | NEC PC9801 | role-play Fantasy | image | | label | |
| Phantasie II | Starcraft | 1987 | Sharp X1 | role-play Fantasy | | | label | |
| Phantasie II | Starcraft | 1987 | NEC PC8801 | role-play Fantasy | image | | label | |
| Phantasie II | Starcraft | 1987 | MICRO 7 - FM7 | role-play | | | label | |
| Phantasie II: Descent Into the Underworld | Logical Design Works | 1986 | Apple II E | role-play Fantasy | image | | label | |
| Phantasie III: The Wrath of Nikademus | Westwood Studios | 1987 | Amiga | role-play Fantasy | image | | label | |
| Phantasie III: The Wrath of Nikademus | Westwood Studios | 1987 | Apple II E | role-play Fantasy | image | | label | |
| Phantasie III: The Wrath of Nikademus | Westwood Studios | 1988 | MS-DOS | role-play Fantasy | image | | label | |
| Phantasie III: The Wrath of Nikademus | Westwood Studios | 1987 | C64 | role-play Fantasy | image | | label | |
| Phantasie III: The Wrath of Nikademus | Westwood Studios | 1987 | Atari ST | role-play Fantasy | image | | label | |
| Phantasie III: The Wrath of Nikademus | Bothtec | 1989 | MSX2 | role-play Fantasy | image | | label | |
| Phantasie III: The Wrath of Nikademus | Starcraft | 1988 | Sharp X1 | role-play Fantasy | | | label | |
| Phantasie III: The Wrath of Nikademus | Starcraft | 1988 | NEC PC8801 | role-play Fantasy | image | | label | |
| Phantasie III: The Wrath of Nikademus | Starcraft | 1988 | NEC PC9801 | role-play Fantasy | image | | label | |
| Phantasie III: The Wrath of Nikademus | Starcraft | 1988 | MICRO 7 - FM7 | role-play Fantasy | | | label | |
| Phantasie III: The Wrath of Nikademus | Starcraft | 1989 | X68000 | role-play Fantasy | image | | label | |
| Phantasie IV: The Birth of Heroes | Bothtec | 1991 | MSX2 | role-play Fantasy | image | | label | |
| Phantasie IV: The Birth of Heroes | Starcraft | 1990 | NEC PC8801 | role-play Fantasy | | | label | |
| Phantasie IV: The Birth of Heroes | Starcraft | 1990 | NEC PC9801 | role-play Fantasy | | | label | |
| Phantasie IV: The Birth of Heroes | Starcraft | 1991 | X68000 | role-play Fantasy | image | | label | |
| Phantom Fighter | Marionette | 1988 | NES | beat 'em up Fantasy | image | subject | label | |
| Pillars of Eternity | Obsidian Entertainment | 2015 | Windows | role-play Fantasy | image | subject | label | |
| Pocket Legends | Spacetime Studios | 2011 | Android | action/reflex role-play Fantasy | | | label | |
| Pool of Radiance | Westwood Associates;SSI Special Projects Group | 1988 | Apple II E | role-play turn-based Fantasy | image | subject | label | |
| Pool of Radiance | SSI Special Projects Group | 1988 | C64 | role-play turn-based Fantasy | image | subject | label | |
| Pool of Radiance | Westwood Associates;SSI Special Projects Group | 1988 | MS-DOS | role-play turn-based Fantasy | image | subject | label | |
| Pool of Radiance | SSI Special Projects Group;Level Systems | 1989 | Mac OS Classic | role-play turn-based Fantasy | image | subject | label | |
| Pool of Radiance | Ubi Soft | 1990 | Amiga | role-play turn-based Fantasy | image | subject | label | |
| Pool of Radiance | Pony Canyon | 1989 | NEC PC8801 | role-play Fantasy | | | label | |
| Pool of Radiance | Pony Canyon | 1990 | Sharp X1 | role-play Fantasy | | | label | |
| Pool of Radiance | Pony Canyon | 1989 | NEC PC9801 | role-play Fantasy | image | | label | |
| Prince of Persia: The Forgotten Sands | Ubisoft Montreal | 2010 | Windows | action/reflex adventure Fantasy | image | subject | label | |
| Project Vaulderie | Project Vaulderie Games | TBA | Linux | action/reflex role-play | | | label | |
| Puzzle Quest 2 | Infinite Interactive | 2010 | Windows | puzzle role-play turn-based Fantasy | image | | label | |
| Puzzle Quest: Challenge of the Warlords | Infinite Interactive | 2007 | PS2 | strategy puzzle role-play Fantasy | image | | label | |
