| Titre | Année | Genre |
|---|---|---|
| Operation Combat II | ???? | Gestion |
| Operation Desert Storm | 1994 | Action |
| Operation Firestorm | 1993 | Action |
| Operation Harrier | ???? | Action |
| Operation Jupiter | ???? | Action |
| Operation Lemming | ???? | Arcade |
| Operation Neptune | 1989 | Action |
| Operation Overlord - The Invasion of Europe | ???? | Stratégie |
| Operation Stealth | ???? | Aventures |
| Operation Thunderbolt | ???? | Tir |
| Operation Wolf | ???? | Tir |
| Opposites Attract | ???? | Educatif |
| Oracle Horse Racing System | 1991 | Gestion |
| Orb | 1994 | Réflexion |
| Orbit | 1994 | Arcade |
| Orbit 2000 | 1991 | Shoot em up |
| Oriental Games | ???? | Aventures |
| Ork | ???? | Plate-forme |
| Ork Attack The Return | ???? | Arcade |
| Ortho-CM | ???? | Educatif |
| Orthogus Tome 1 | ???? | Educatif |
| Ortotris | 1994 | Réflexion |
| Oscar | ???? | Plate-forme |
| Osiris | ???? | Réflexion |
| Oswald | ???? | Arcade |
| OsWALD of the Ice Floes | ???? | Arcade |
| Othello Killer | 1989 | Réflexion |
| Otik Gold Edice | ???? | Aventures |
| Out of this World | ???? | Aventures |
| Out Run | 1989 | Course |
| Out Run Europa | ???? | Course de motos |
| Out to Lunch | ???? | Plate-forme |
| Outerim | ???? | Gestion |
| Outfall | 1995 | Réflexion |
| Outlands | ???? | Shoot em up |
| Outliner | 1996 | Shoot em up |
| Outpost - Solo Assault | 1991 | Vaisseau spatial |
| Outzone | ???? | Shoot em up |
| Over the Net | ???? | Volleyball |
| Overdose | 1996 | Réflexion |
| Overdrive | ???? | Action |
| Overkill | ???? | Shoot em up |
| Overlander | ???? | Course |
| Overlord | ???? | Aventures |
| Overrun! - A Tactical Game of Modern Land Warfare | ???? | Stratégie |
| OverTaking | 1994 | Arcade |
| Oxxonian | ???? | Arcade |
| Oxyd | ???? | Réflexion |
| Oxyd Magnum! | ???? | Arcade |
| Oxyd Magnum! | 1993 | Arcade |
