| Obscure |
| Obscure II |
| Obscure: The Aftermath |
| Okage: Shadow King |
| Okami (5) |
| One Piece |
| One Piece: Grand Battle (3) |
| One Piece: Grand Battle! 3 (2) |
| One Piece: Pirates' Carnival (2) |
| One Piece: Round the Land! (2) |
| Oni (2) |
| Onimusha 2: Samurai's Destiny (3) |
| Onimusha 3: Demon Siege (2) |
| Onimusha: Blade Warriors |
| Onimusha: Dawn Of Dreams |
| Onimusha: Warlords (4) |
| Open Season |
| Operative: No One Lives Forever, The |
| OPM Demo Disc #68 |
| Orphen: Scion Of Sorcery (2) |
| Outlaw Golf 2 |
| Outlaw Tennis (2) |
| Outlaw Volleyball Remixed |
| OutRun 2 SP: Special Tours |
| OutRun 2006: Coast 2 Coast |
| Over the Hedge |
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