| Title | Genre | Platform | Last Updated |
|---|---|---|---|
| Obscure: The Aftermath | Survival Horror | psp | June 1, 2010 |
| Obscure: The Aftermath | Survival Horror | ps2 | February 8, 2008 |
| Oddworld: Munch's Oddysee | Platformer | psvita | June 14, 2011 |
| Oddworld: Stranger's Wrath | Action/Adventure | psvita | June 14, 2011 |
| Odin Sphere | Role-Playing | ps2 | April 19, 2007 |
| Of Orcs and Men | Role-Playing | ps3 | October 6, 2011 |
| Ogrebattle | Real-Time Strategy | ps1 | January 29, 2008 |
| Okabu | Adventure | ps3 | October 3, 2011 |
| Okami | Adventure | ps2 | September 19, 2006 |
| Omikron 2 | Action/Adventure | ps3 | June 9, 2005 |
| One Piece: Grand Adventure | Fighting | ps2 | September 12, 2006 |
| One Piece: Grand Battle | Fighting | ps2 | September 12, 2005 |
| One Piece: Pirates' Carnival | Party | ps2 | September 12, 2006 |
| Oni | Action | ps2 | December 12, 2004 |
| Onimusha 2: Samurai's Destiny | Action/Adventure | ps2 | December 12, 2004 |
