The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- ADP set (4 members)
- ARC-L1 Wide Forest Station images (1 member)
- ARC-L1 images (1 member)
- ARC-L2 images (1 member)
- ARC-L3 images (1 member)
- ARC-L4 images (1 member)
- ARC-L5 images (1 member)
- ARGO Astronautics (0 members)
- ATVS Repeater images (1 member)
- AVS-E set (2 members)
- A Human Perspective (0 members)
- A Separate Law (0 members)
- Abbreviations (51 members)
- Aberdeen (5 members)
- Aberdeen images (23 members)
- Ace Astrogation (4 members)
- Aciedo Station images (1 member)
- Active Duty Military Characters (54 members)
- Active Political Office Holders (34 members)
- Active Talk Pages (10 members)
- Active for Squadron 42 (11 members)
- Active production (2 members)
- Add-ons (10 members)
- Adir images (6 members)
- Administration and sales centers (1 member)
- Administrators (1 member)
- Advertisement (0 members)
- Advocacy Archive (0 members)
- Advocacy Faction Characters (1 member)
- Aegis Dynamics (53 members)
- Aelanna Tesla Images (32 members)
- Aeroview Hangars (1 member)
- Agricultural supplies (4 members)
- Ail'ka System (10 members)
- Alejo Brothers (7 members)
- Alien Languages (1 member)
- Alien Races (6 members)
- Alien language templates (5 members)
- Alloys (4 members)
- Always Forward (0 members)
- Amon and Reese Co. (19 members)
- Angeli (1 member)
- Angeli images (1 member)
- Animus Missile Launcher (1 member)
- Animus Missile Launcher images (3 members)
- Anti-aircraft turrets (1 member)
- Anti-personnel mines (1 member)
- Anti-personnel turrets (1 member)
- Anvil Aerospace (32 members)
- AopoA (0 members)