The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 3D Models (7 members)
- Advanced Refinement (4 members)
- Ammo (8 members)
- April Fools 2022 images (1 member)
- Architecture buildings (9 members)
- Artifacts (2 members)
- Attachments (0 members)
- Audio (2 members)
- Basic Walls (6 members)
- Beams (2 members)
- Biomass (13 members)
- Body equipment (5 members)
- Broken history (8 members)
- BuildMenu icons (17 members)
- Building icons (510 members)
- Building materials (35 members)
- Building screenshots (58 members)
- Buildings (109 members)
- Buildings/es (2 members)
- Buildings/zh (5 members)
- CS image redirects (124 members)
- Calculation templates (0 members)
- Candidates for deletion (6 members)
- Candidates for speedy deletion (0 members)
- Cargo declaring templates (9 members)
- Cargo declaring templates/es (2 members)
- Cargo helper templates (6 members)
- Cargo query modules (7 members)
- Cargo query templates (7 members)
- Cargo storing templates (14 members)
- Cargo storing templates/es (2 members)
- Cargo templates (5 members)
- Catwalks (6 members)
- Character images (4 members)
- Citation needed (10 members)
- Cleanup (24 members)
- Closed Alpha patch notes (2 members)
- Coffee Stain Instagram Stories (13 members)
- Coffee Stain Livestream Videos (8 members)
- Communications (4 members)
- Community (6 members)
- Concept art (13 members)
- Consumables (4 members)
- Containers (3 members)
- Conveyor Belts (1 member)
- Conveyor Connections (9 members)
- Conveyor Lifts (0 members)
- Conveyor Supports (1 member)
- Copyright templates (13 members)
- Crafted with (0 members)