 O.R.B. - Off-World Resource Base (7) |
 Obi-Wan (14) - Reviews and Previews |
| Obi-Wan's Adventures (2) |
| Oblivion (27) - Fan Pages; Shivering Isles, The; Interviews |
| Obsidian (10) - Reviews and Previews |
| Oddballz (7) - Reviews and Previews |
| Odin Sphere (7) |
| Odyssey - The Search for Ulysses (4) |
| Of Steamworks & Magick Obscura (20) - Reviews and Previews |
| Ogre Battle (4) |
| Okage - Shadow King (5) |
| Okami (5) |
| Omega - the Rogue-like RPG (5) |
| Omega Five (6) |
| Omega Soldier (1) |
| Omega Stone, The (6) - Reviews and Previews |
| Omega Strain, The (5) - Reviews and Previews |
| Omikron - The Nomad Soul (4) |
| Once and Future (2) |
| Once Upon a Knight (12) - Reviews and Previews |
| One Dark Night (1) |
| One of Our Wombats Is Missing (1) |
| One Piece Mansion (2) |
| One That Got Away, The (2) |
| One-Line Puzzle (4) |
| Oni (20) - Reviews and Previews; Cheats and Hints |
| Online Chess Kingdoms (4) |
| Ooga Booga (6) |
| Open For Business - Sims 2, The (5) |
| Open Warfare (7) |
| Open Warfare 2 (7) |
| Operation Annihilation (6) |
| Operation Blockade (4) |
| Operation Darkness (5) |
| Operation Dorian Gray (6) |
| Operation Exodus (4) |
| Operation Flashpoint (25) - Reviews and Previews; Clans and Guilds; Resistance |
| Operation Genesis (12) - Reviews and Previews |
| Operation Green (6) |
| Operation Meltdown - Land, Sea, Air (2) |
| Operation Surma (9) |
| Operational Art of War Series (4) |
| Operative, The - No One Lives Forever (19) - Reviews and Previews |
| Opoona (7) |
| Opposing Force (9) - Reviews and Previews |
| Opposing Fronts (7) |
| Orbiter (8) |
| Orcs & Elves (6) |
| Orcs & Humans (2) |
| Order of Dawn, The (6) |
| Order of Ecclesia (5) |
| Order of the Flame (6) - Reviews and Previews |
| Order of the Phoenix (6) |
| Original Adventure (9) |
| Orphen - Scion of Sorcery (4) |
| Ostfront 41-45 (7) |
| Otogi - Myth of Demons (4) - Reviews and Previews |
| Outcast (2) |
| Outfit, The (6) |
| Outlaw Golf (4) |
| Outlaw Volleyball (9) |
| Outlaws (4) - Cast and Crew; Reviews and Previews |
| Outtrigger (1) |
| Outwars (4) |
| Over G Fighters (7) |
| Over the Hedge (6) |
| Overlord (7) |
| Overseer (6) |
List of web sites about Video Games: O. Links and information. Onimusha Series; Oblivion; Operation Flashpoint
