PlayStation - O
- O.D.T.
- Oddworld - Abe's Exoddus
- Oddworld - Abe's Oddysee
- Oddworld 2 - Abe's Exoddus
- Oddworld Abes Exoddus
- Oddworld Abes Oddyse
- Odo Odo Oddity
- ODT
- Off World Interceptor
- Off-World Interceptor Extreme
- Offworld Interceptor Extreme
- Ogre Battle
- Oh No! More Lemmings
- Ohlins Hyper Rally
- Olympic Soccer
- Olympic Summer Games
- Omega Boost
- One
- One Piece - Grand Battle
- One Piece Grand Battle
- One Piece Mansion
- Onimusha
- OPM Demo
- OPM Euro Demo
- Option Tuning Car Battle
- Option Tuning Car Battle 2
- Option Tuning Car Battle NTSC
- Option Tuning Car Battle Spec-R
- Other Life Azure Dreams
- Outlaws of the Lost Dynasty
- Over Drivin' - Skyline Memorial
- Over Drivin' 3 - Hot Pursuit
- Overblood
- Overblood 2
- Overblood 2 NTSC
- Overblood NTSC
- Overboard
- Overboard!