| title | developer | year | platform | | pop. |
|---|
| UFO: Afterlight | ALTAR Games | 2007 | Windows | strategy role-play Science Fiction | image | subject | label | |
| UFO: Aftershock | ALTAR Interactive | 2005 | Windows | strategy Science Fiction | image | subject | label | |
| Ukrainian Rumble 2 | Ukrainian Brothers | ? | Linux | shooter | | | label | |
| Ultratron | Puppygames | 2009 | Linux | shooter Science Fiction | image | subject | label | |
| Underrail | Stygian Software | 2015 | Windows | role-play turn-based | image | subject | label | |
| Underworld Online | author | ? | Linux | casino/cards Fantasy | | | label | |
| UnEpic | author | 2011 | Windows | action/reflex platformer role-play Fantasy | image | subject | label | |
| UnEpic | author | 2014 | Linux | action/reflex platformer role-play Fantasy | | | label | |
| UnEpic | author | 2014 | Mac OS X | action/reflex platformer role-play Fantasy | | | label | |
| Universe at War: Earth Assault | Petroglyph Games | 2007 | Windows | strategy 3D | image | subject | label | |
| Universe at War: Earth Assault | Petroglyph Games | 2008 | X360 | strategy Science Fiction | image | | label | |
| Unreal II – The Awakening | Legend Entertainment | 2003 | Windows | shooter Science Fiction | image | | label | |
| UNSTOPPABLE | Gruesome Games | 2010 | Linux | role-play Science Fiction | | | label | |
| Urban Assault | TerraTools | 1998 | Windows | shooter strategy Science Fiction | image | | label | |
| Urban Assault: Metropolis Dawn | TerraTools | 1998 | Windows | shooter strategy Science Fiction | | | label | |
