The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Achievements (21 members)
- Activated Collectibles (84 members)
- Added in Afterbirth (69 members)
- Added in Afterbirth+ (64 members)
- Afterbirth (33 members)
- Afterbirth † (15 members)
- Bob Items (3 members)
- Bomb items (15 members)
- Booster Pack 1 (6 members)
- Booster Pack 2 (4 members)
- Booster Pack 3 (1 member)
- Booster Pack 4 (2 members)
- Bugs (38 members)
- Candidates for deletion (1 member)
- Candidates for speedy deletion (0 members)
- Citation needed (1 member)
- Cleanup (0 members)
- Community (5 members)
- Conjoined Items (7 members)
- Copyright templates (12 members)
- Damage-preventing items (13 members)
- Damage-triggered items (16 members)
- Disambiguations (0 members)
- Documentation templates (3 members)
- Familiars (3 members)
- Flight-granting items (1 member)
- Formatting templates (22 members)
- Front page sections (4 members)
- Gamepedia Blocks (0 members)
- Guides (10 members)
- Hidden categories (0 members)
- If-then-else templates (1 member)
- Images (7 members)
- Images needing improvement (0 members)
- Infobox templates (6 members)
- Item Pool Templates (28 members)
- Items (355 members)
- Legal notices (3 members)
- Leviathan Items (1 member)
- Media (2 members)
- Modified in Afterbirth (263 members)
- Modified in Afterbirth+ (99 members)
- Mom's Items (8 members)
- Mushroom Items (5 members)
- Navigation bar templates (1 member)
- Navigation templates (3 members)
- Notice templates (16 members)
- Pages needing clarification (1 member)
- Pages to be merged (0 members)
- Pages to be moved (0 members)