The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Arkane Studios (Developer) (1 member)
- Arkedo Studio (Developer) (2 members)
- 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)
- Atlus (Publisher) (16 members)
- Atlus USA (Publisher) (7 members)
- Atomic Elbow (Developer) (1 member)
- Audio buffer duration (Config) (7 members)
- Audio format: Automatic (Config) (1 member)
- Augmented reality (Genre) (4 members)
- Australia (Release region) (639 members)
- Autumn Games (Publisher) (2 members)
- Avalanche Software (Developer) (7 members)
- Avalanche Studios (Developer) (2 members)
- AyeWARE (Publisher) (1 member)
- B.B. Studio (Developer) (9 members)
- B.B Studio (Developer) (1 member)
- BBC Worldwide (Publisher) (1 member)
- BaKno Games (Developer) (1 member)
- BaKno Games (Publisher) (1 member)
- Backbone Entertainment (Developer) (15 members)
- Backbreaker (Series) (2 members)
- Bad Robot Interactive (Developer) (1 member)
- Badland Games (Publisher) (1 member)
- Badland games (Publisher) (1 member)
- Bakugan (Series) (2 members)
- Bandai Namco Games (Developer) (36 members)
- Bandai Namco Games (Publisher) (139 members)
- Banpresto (Developer) (4 members)
- BaseSon (Developer) (2 members)
- Batman: Arkham (Series) (4 members)
- Battlefield (Series) (6 members)