The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Ancient Items (128 members)
- Ancient templates (26 members)
- Apparatuses (12 members)
- Armor (120 members)
- Blocks (67 members)
- BoFS (4 members)
- Buff icons (44 members)
- Buildings (31 members)
- Candidates for deletion (3 members)
- Candidates for speedy deletion (0 members)
- Characters (0 members)
- Citation needed (0 members)
- Class Ancients (4 members)
- Classes (10 members)
- Cleanup (0 members)
- Community (4 members)
- Copyright templates (12 members)
- Creature icons (93 members)
- Crystals (11 members)
- Damage (2 members)
- Disambiguations (0 members)
- Documentation templates (3 members)
- Events (9 members)
- Food (44 members)
- Formatting templates (22 members)
- Front page sections (4 members)
- Game assets (8 members)
- Gameplay (2 members)
- Guides (44 members)
- Hidden categories (0 members)
- Images (21 members)
- Images needing improvement (0 members)
- Infobox templates (4 members)
- It Lurks Below (21 members)
- It Lurks Below Wiki (9 members)
- Item icons (480 members)
- Item templates (2 members)
- Items (653 members)
- Items needing icons (0 members)
- Layers needing an image (0 members)
- Legal notices (3 members)
- Locations (14 members)
- Main (0 members)
- Materials (4 members)
- Media (2 members)
- Monsters (42 members)
- NPC icons (16 members)
- NPCs (19 members)
- Nav Templates (30 members)
- Navigation templates (12 members)