The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- The Butcher Helmet images (1 member)
- The Coil images (5 members)
- The Hill Horror Helmet images (4 members)
- The Lost Generation (0 members)
- The Observist (2 members)
- The Only Constant images (5 members)
- The Shipyard (0 members)
- Theatres of War images (2 members)
- Thermyte Concern (11 members)
- This Day in History (0 members)
- Tiber System (6 members)
- Tigerstrike T-19P images (1 member)
- Tigerstrike T-21 images (1 member)
- Tiles (1 member)
- Time Capsule (0 members)
- Title Icons (61 members)
- Titles (80 members)
- Titus Costigan images (1 member)
- Tobin Expo Center images (1 member)
- Tohil III images (1 member)
- Tohil System (9 members)
- Tomahawk Images (1 member)
- Torral Aggregate (3 members)
- Torso armor (29 members)
- Torso armor images (33 members)
- Touchstone (8x Monitor) images (1 member)
- Towns (1 member)
- Toy pistols (1 member)
- Tracker (0 members)
- Tractor Beam (1 member)
- Tram & Myers Mining Corp (1 member)
- Transitional Systems (8 members)
- Transitionalists (5 members)
- Translation templates (1 member)
- Transmission (5 members)
- Transmissions (0 members)
- Transport (0 members)
- Transport industry (1 member)
- Transports (8 members)
- Treaty (1 member)
- Trident Attack Systems (3 members)
- Trise I (1 member)
- Trise System (5 members)
- Troubleshooting (0 members)
- TrueDef-Pro Core images (1 member)
- TrueDef-Pro images (1 member)
- TrueDef-Pro set (5 members)
- Tumbril Land Systems (14 members)
- Turrets (2 members)
- Twyns Sandwiches images (2 members)