| TITEL | PRODUCER | SYSTEM | GRAPHIC | COMBAT-MODE | PARTY | AUTOMAPPING | PECULIARITIES | PUBLICATION | DIFFICULTY | SCENARIO | LANGUAGE | Remarks |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| OMEGA | Lawrence R. Brothers / Erik Max Francis | MS-DOS | 3-D | Real-time | 1 | ? | Freeware, funny and large crpg with landscape quests | Maintained up to 1994 | 1-2 | Fantasy | English | omexe802.zip to download as Version 8.02 |
| ORDER OF THE GRIFFON | ? | PC-Engine | Birds-eye | Round-based | 3 | No | AD&D | ? | ? | Fantasy | English | |
| OGRE BATTLE III | Nintendo | N64 | Isometric | Round-based | 5 | No | ? | 1999 | ? | Fantasy | Japanese | |
| OMIKRON: The nomad soul | Eidos | PS 1 | ? | Real-time | 1 | ? | You can go into the body of a monster | 1999 | ? | Fantasy | English | |
| ORCS: Revenge of the ancients | Berkeley Systems / Havas Interactive | WIN98 | Adjustable | Real-time | 4 | Yes | Lord of the rings world, multiplayer | 1999 | ? | Fantasy | English | |
| OBITUS | Psygnosis | Amiga,MS-DOS | 2-D,3-D | Real-time | 1 | No | Arcadelike 2-D sequences | 1991 | 2 | Fantasy | English,german,french,spanish,italian | |
| ONE/FOURTH | From | Playstation II | ? | ? | ? | ? | ? | 2000 | ? | Fantasy | Japanese | |
| ONE PIECE: Birth of the pirate dream | Banpresto | Game Boy Colour | ? | ? | ? | ? | ? | 2000 | ? | Fantasy | Japanese | |
| OUGON NO TAIYO | Nintendo | Game Boy Advance | Birds-eye | Real-time | 1 | No | ? | 2001 | ? | Fantasy | Japanese | |
| OKAGE: Shadow king | Sony | PS 2 | ? | ? | ? | ? | ? | 2001 | ? | Fantasy | English | |
| OFFROAD OUTLAWS | Interplay | PSII | ? | ? | ? | ? | ? | 2000 | ? | Fantasy | English | |
| OUBLIETTE | Human Engineered Software/Bear Systems | MS-DOS,C64 | Birds-eye,3-D | Round-based | 6 | No | Open-ended (no ending to the game) | 1983 | ? | Fantasy | English |