Companies
- Odd Meter
- Offworld Industries
- Omega Force
- OneMoreLevel
- OnLive
- Overhaul Games
- Overkill Software
- Owlcat Games
- Oxide Games
- Packom Interactive
- Pandemic Studios
- Paradox Development Studio
- Paradox Interactive
- Paradox Tectonic
- Parallel Studio
- Paramount
- Paramount Pictures
- Parsec Productions
- Peacock
- Pearl Abyss
- PEGI
- People Can Fly
- perfect world
- Petroglyph Games
- Phenomic Game Development