
| # | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
| Name | Publisher | Loader Type | Additional info |
| Oberon 69 | GLL | - | - |
| Obliterator | Melbourne House | - | - |
| Ocean Conqueror | Rack-It | - | - |
| Octagon | Budgie Budget | - | - |
| Octagon Squad | Mastertronic | - | - |
| Octan | Silverbird | - | - |
| Oink | CRL | - | - |
| O.K.Yah! | Pirate | - | - |
| Olli&Lissa | Firebird | - | - |
| Olli&Lissa-2:Halloween | Silverbird | - | - |
| Olympiad'86 | Atlantis | - | - |
| Omega One | Mastertronic | - | - |
| One For The Road | Tynesoft | - | - |
| On The Oche | Artic | - | - |
| On The Run | Design Design | - | - |
| Oops! | The Big Apple | - | - |
| Operation Hanoi | Players Premier | - | - |
| Operation Thunderbolt | Ocean | - | - |
| Orbix The Terrorball | Streetwise | - | - |
| Orc Attack | Creative Sparks | - | - |
| Outlaw | Players Premier | - | - |
| Out Of The Shadows | Mizar | - | - |
| Overlander | Elite | - | 128k |
| Overlords | MC Lothlorien | - | - |
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