List of games: O
- Obscure
- Obscure (PS2)
- ObsCure 2
- ObsCure 2 (PS2)
- Oceans 4
- Oddboxx
- Oddworld 2: Abes Exoddus
- Oddworld: Abes Oddysee
- Oddworld: Strangers Wrath
- Odin Sphere
- Off-Road Drive
- Officers
- Oil Rush
- Okami
- Okami (Wii)
- Omega Project (Hra Zrušena?)
- One epic game (PS3)
- One Must Fall: Battlegrounds
- Onimusha 3: Demon Siege
- Onimusha: Dawn of Dreams
- Open Season
- Open Season (PS2)
- Operation Air Assault
- Operation Flashpoint
- Operation Flashpoint : Elite
- Operation Flashpoint 2: Dragon Rising
- Operation Flashpoint 2: Dragon Rising (PS3)
- Operation Flashpoint 2: Dragon Rising (X360)
- Operation Flashpoint: Red River
- Operation: Matriarchy
- Orcs Must Die! (X360)
- Order of War
- Order of War: Challenge
- Original War
- Osmos
- Ostrich Runner
- Otherland
- OutCry (Sublustrum)
- Outlaw Chopper
- OutRun 2006: Coast 2 Coast
- OutRun 2006: Coast 2 Coast (PS2)
- OutRun 2006: Coast 2 Coast (PSP)
- Over G Fighters
- Over the Hedge
- Over the Hedge (PS2)
- Overclocked
- Overlord
- Overlord (X360)
- Overlord 2
- Overlord 2 (X360)