The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- C-788 Cannon images (1 member)
- C1 Spirit images (16 members)
- C2 Hercules images (106 members)
- C54 SMG (1 member)
- C54 SMG images (2 members)
- C8R Pisces Rescue images (40 members)
- C8X Pisces Expedition images (28 members)
- C8 Pisces images (49 members)
- CBD (23 members)
- CBH-3 Helmet images (1 member)
- CC's Conversions (48 members)
- CC-zero files (28 members)
- CF-447 Rhino Repeater images (1 member)
- CF-Series Repeater images (1 member)
- CRU-L1 Ambitious Dream Station images (1 member)
- CRU-L1 images (3 members)
- CRU-L4 Shallow Fields Station images (1 member)
- CRU-L4 images (1 member)
- CRU-L5 Beautiful Glen Station images (1 member)
- CRU-L5 images (1 member)
- CSP-68H Backpack images (1 member)
- CSP-68L Backpack images (1 member)
- CSP-68M Backpack images (1 member)
- CS missiles (5 members)
- CS torpedoes (2 members)
- CVSA Cannon images (1 member)
- Cal-O-Meal Protein Bar images (3 members)
- Caldera (8 members)
- Caliban (1 member)
- Caliban 3a images (1 member)
- Caliban 3b images (1 member)
- Caliban 4a images (1 member)
- Caliban 4b images (1 member)
- Caliban 4c images (1 member)
- Caliban 4d images (1 member)
- Caliban 4e images (1 member)
- Caliban 4f images (1 member)
- Caliban III images (1 member)
- Caliban IV images (1 member)
- Caliban I images (1 member)
- Caliban System (20 members)
- Caliban V images (1 member)
- Calico Helmet images (1 member)
- Calico images (2 members)
- Calico set (5 members)
- Calliope (11 members)
- Calliope images (8 members)
- Calva Helmet images (7 members)
- Candidates for deletion (5 members)
- Cano II images (1 member)