| title | developer | year | game type | | pop. |
|---|
| Obscure: The Aftermath | Hydravision | 2009 | PSP | action/reflex adventure Horror | image | subject | | |
| Off Road | Xplosiv | 2008 | PSP | racing/driving | image | subject | | |
| OMG-Z | Laughing Jackal | 2011 | PSP | strategy | image | | label | |
| One Chanbara Special | Tamsoft | 2007 | PSP | beat 'em up | image | | label | |
| One Epic Game | Grip Games | 2011 | PSP | action/reflex | | | | |
| Onore no Shinzuru Michi wo Yuke | Silicon Studio | 2009 | PSP | action/reflex adventure puzzle | image | | label | |
| Ooedo Senryoubako | Taito | 2006 | PSP | action/reflex | | | | |
| Open Season | Ubisoft Montreal Studios;Ubisoft Quebec City | 2006 | PSP | platformer | image | | | |
| OpenTTD-PSP | ? | 2007 | PSP | simulation strategy | image | | label | |
| Ore no Dungeon | Climax | 2006 | PSP | role-play | image | | | |
| Ore no Kanojo no Uraomote | Aries | 2013 | PSP | adventure | | | label | |
| Ore no Shikabane o Koete Yuke | Alfa System | 2011 | PSP | role-play Manga | image | | label | |
| Osananajimi to Ama~ku Ecchi ni Sugosu Houhou | Atelier Kaguya BerkshireYorkshire | 2010 | PSP | adventure | | | label | |
| OutRun2006: Coast 2 Coast | Sumo Digital | 2006 | PSP | racing/driving | image | | label | |
