The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Re-Logic (Developer) (1 member)
- Read color buffers: Off (Config) (1 member)
- Read color buffers: On (Config) (35 members)
- Read depth buffers: On (Config) (5 members)
- Ready at Dawn (Developer) (1 member)
- Real-time strategy (Genre) (2 members)
- Real-time tactics (Genre) (2 members)
- Reality Pump (Developer) (2 members)
- Realta Entertainment Group (Developer) (1 member)
- Rebellion Developments (Developer) (7 members)
- Recoil Games (Developer) (1 member)
- Recom (Developer) (1 member)
- Recom (Publisher) (2 members)
- Record of Agarest (Series) (3 members)
- Red Dead (Series) (2 members)
- Red Entertainment (Developer) (2 members)
- Red Faction (Series) (3 members)
- Red Fly Studio (Developer) (1 member)
- Red Hare Studios (Developer) (1 member)
- Red Hare Studios (Publisher) (1 member)