| Title | Year | Genre |
|---|---|---|
| O Tac-Tic | ???? | Puzzle |
| Obliterator | 1988 | Action |
| Obsidian | 1985 | Action |
| Ocean Conqueror | 1987 | Action |
| Octoplex | 1989 | Arcade |
| Oeil De Set, L' | 1987 | Adventure |
| Off Shore Warrior | 1989 | Racing |
| Oh Mummy | 1984 | Arcade |
| Oilmania | 1990 | Arcade |
| Oink! The Game | 1987 | Breakout |
| Ole Toro | 1985 | Arcade |
| Olli and Lissa - Ghost of Shilmoore | 1987 | Platform |
| Olli and Lissa 3 - The Candlelight Adventure | 1989 | Platform |
| Olympiad | 1986 | Sports |
| Omega Dimension | 1989 | Action |
| Omega Planete Invisible | 1987 | Adventure |
| Omeyad | 1989 | Adventure |
| On Cue | 1987 | Pool |
| On The Run | 1985 | Action |
| One | 1986 | Arcade |
| One Man and His Droid | 1985 | Arcade |
| Operation Gunship | 1989 | Shooter |
| Operation Hanoi | 1990 | Gun shooter |
| Operation Hormuz | 1988 | Aerial fighting |
| Operation Nemo | 1987 | Aerial fighting |
| Operation Thunderbolt | 1989 | Gun shooter |
| Operation Wolf | 1988 | Gun shooter |
| Oriental Games | 1990 | Fighting |
| Ormuz | 1988 | Action |
| Orphee | 1985 | Adventure |
| Othello Master | 1985 | Puzzle |
| Out of this World | 1987 | Shooter |
| Out Run | 1986 | Racing |
| Out Run Europa | 1991 | Racing |
| Outboard | 1990 | Racing |
| Outlaw | 1990 | Action |
| Overlander | 1988 | Racing |
| Overlord 2 | 1984 | Strategy |
| Oxphar | 1987 | Adventure |
