| X-Isle | Xbox | First Person Shooter | Cancelled |
| X-Men Legends | Xbox | Action/RPG | 9/21/2004 |
| X-Men Legends II: Rise of Apocalypse | Xbox | Action/RPG | 9/20/2005 |
| X-Men: Next Dimension | Xbox | Fighting | 10/29/2002 |
| X-Men: The Official Game | Xbox | Action/Adventure | 5/16/2006 |
| X2: Wolverine’s Revenge | Xbox | Action | 4/15/2003 |
| X3: Reunion | Xbox | Space Sim | Cancelled |
| Xavier Fox: The Lost City | Xbox | Adventure | To Be Announced |
| Xbox 360 | Xbox | Other | Cancelled |
| Xbox Live 2.0 | Xbox | TBA | To Be Announced |
| Xbox Live Arcade | Xbox | Other | 11/4/2004 |
| Xbox Live Arcade - Mutant Storm | Xbox | Action | To Be Announced |
| Xbox Live Arcade - Namco Vintage | Xbox | Compilations | 11/4/2004 |
| Xbox LIVE Boot Camp | Xbox | Action | Cancelled |
| Xbox LIVE Launch Japan | Xbox | Action | Cancelled |
| Xbox Music Mixer | Xbox | Music/Dance | 10/21/2003 |
| Xbox: Green Version | Xbox | Action | Cancelled |
| XGRA | Xbox | Combat Racing | 9/9/2003 |
| Xiaolin Showdown | Xbox | Action | 11/14/2006 |
| XIII | Xbox | First Person Shooter | 11/6/2003 |
| Xyanide | Xbox | Action/Shooter | Jul. 2006 |