The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Charon V images (1 member)
- Chemline Solutions (1 member)
- Chimera Communications (7 members)
- Chronicles (0 members)
- Chronos System (7 members)
- Chthonian Planet (7 members)
- Citadel images (5 members)
- Citadel set (4 members)
- Citation (1 member)
- Citation Templates (0 members)
- Citation templates (17 members)
- Cities (40 members)
- CitizenCon (1 member)
- CitizenCon 2018 (9 members)
- CitizenCon 2019 sessions (2 members)
- CitizenCon 2022 (1 member)
- CitizenCon 2948 (1 member)
- CitizenCon sessions (1 member)
- Citizencon 2018 (9 members)
- Citizens (0 members)
- City Districts (2 members)
- City Lights (7 members)
- Civilian Carrack-class vessels (2 members)
- Civilian Constellation-class vessels (1 member)
- Civilian Defense Force images (2 members)
- Civilian Freelancer-class vessels (1 member)
- Civilian Hammerhead-class vessels (1 member)
- Civilian Idris-Class Vessels (3 members)
- Civilian Mercury-class vessels (1 member)
- Civilian computers (8 members)
- Civilian coolers (36 members)
- Civilian mining laser heads (0 members)
- Civilian power plants (23 members)
- Civilian quantum drives (26 members)
- Civilian radars (8 members)
- Civilian shield generators (19 members)
- Clark Defense Systems (46 members)
- Clash (armor) set (5 members)
- Clash armor images (2 members)
- Clash images (5 members)
- Clean Shot (0 members)
- Cleaver images (5 members)
- Clio (4 members)
- Clio images (14 members)
- Clothing (217 members)
- Clothing images (133 members)
- Clothing industry (23 members)
- Clothing set (1 member)
- Cloud Imperium Staff images (9 members)
- Cloud Imperium images (7,682 members)