| Title | Year | Genre |
|---|---|---|
| Oceans Below | 1995 | Educational |
| Off-World Interceptor | 1994 | Action |
| Ogura Hyakunin Isshu | 1995 | Adventure |
| Olympic Soccer - Atlanta 1996 | 1996 | Soccer |
| Olympic Summer Games - Atlanta 1996 | 1996 | Sports |
| Oneesan to Issho! Janken Paradise | 1994 | Adventure |
| Oneesan to Issho! Kisekae Paradise | 1995 | Adventure |
| OnSide Soccer | 2007 | Soccer |
| Oukoku no Grand Chef | 1996 | RPG |
| Out of This World | 1994 | Adventure |
| Outer World | 1994 | Adventure |
| Oyaji Hunter Mahjong | 1995 | Mahjong |
