The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Armature Studio (Developer) (1 member)
- Armored Core (Series) (4 members)
- Army of TWO (Series) (3 members)
- Arrowhead Game Studios (Developer) (1 member)
- Artdink (Developer) (6 members)
- Artech Studios (Developer) (1 member)
- Artificial Mind and Movement (Developer) (3 members)
- Artillery (Genre) (4 members)
- Artoon (Developer) (1 member)
- Ascaron (Developer) (1 member)
- Asobo Studio (Developer) (4 members)
- Aspect ratio: 16:9 (Config) (0 members)
- Aspyr Media (Publisher) (1 member)
- Assassin's Creed (Series) (9 members)
- Asynchronous texture streaming: Off (Config) (5 members)
- Asynchronous texture streaming: On (Config) (22 members)
- Atari (Developer) (2 members)
- Atari (Publisher) (11 members)
- Atelier (Series) (7 members)
- Atlus (Developer) (4 members)