| Title | Year | Genre |
|---|---|---|
| Obitus | 1992 | Adventure |
| Ocean Beach Volley | 1989 | Volleyball |
| Off Shore Warrior | 1988 | Racing |
| OGRE | 1986 | Strategy |
| Oh-no ! More Lemmings | 1991 | Puzzle |
| Oids | 1987 | Shooter |
| Oil Imperium | ???? | Management |
| Oilmania | 1991 | Arcade |
| Oliver and Company | 1989 | Arcade |
| Omnicron Conspiracy | 1990 | Spaceship |
| One Step Beyond | 1993 | Puzzle |
| Onslaught | 1989 | Action |
| Onyx | ???? | Shooter |
| Ooze - Creepy Nights | 1989 | Adventure |
| Operation Cleanstreets | 1988 | Beat em up |
| Operation Harrier | 1990 | Aerial fighting |
| Operation Hormuz | ???? | Aerial fighting |
| Operation Jupiter | 1988 | Action |
| Operation Neptune | 1989 | Action |
| Operation Thunderbolt | 1989 | Gun shooter |
| Oriental Games | ???? | Fighting |
| Out Run | 1987 | Racing |
| Outzone | 1991 | Puzzle |
| Overlander | 1988 | Racing |
| Oxxonian | 1989 | Arcade |
| Ozone | 1992 | Platform |
