The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Anisotropic filter: Auto (Config) (26 members)
- Anti-aliasing: Auto (Config) (2 members)
- Anti-aliasing: Disabled (Config) (10 members)
- ApolloSoft (Developer) (1 member)
- Aqua Plus (Publisher) (1 member)
- Aquaplus (Developer) (6 members)
- Aquaplus (Publisher) (7 members)
- Ar Tonecilo (Series) (1 member)
- Arc System Works (Developer) (16 members)
- Arc System Works (Publisher) (15 members)
- Arcade (Genre) (1 member)
- 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)