The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- API (2 members)
- API Discussion (0 members)
- Application (13 members)
- Archived (30 members)
- Article management templates (58 members)
- Article stubs (9 members)
- Beta (258 members)
- Blog posts (58 members)
- Bracket templates (2 members)
- Browse (0 members)
- CC-BY-SA-3.0 Images (0 members)
- CC-BY-SA-4.0 Images (1 member)
- CSS (659 members)
- CSS/Bug fixes (7 members)
- CSS/Discussions (2 members)
- CSS/Editing customizations (30 members)
- CSS/Libraries (19 members)
- CSS/Personal use (551 members)
- CSS/Retro (86 members)
- CSS/Site-wide use (329 members)
- CSS/Site enhancements (128 members)
- CSS/Unknown use (0 members)
- CSS/User customizations (257 members)
- CSS/Vanilla MediaWiki use (2 members)
- CSS Development (0 members)
- Candidates for deletion (6 members)
- Community (13 members)
- Content (22 members)
- Content by language (3 members)
- Content by status (6 members)
- Content without description (0 members)
- Content without type categorization (0 members)
- Data modules (1 member)
- Demo pages (17 members)
- Deprecated modules (2 members)
- Disambiguations (0 members)
- Discussions Scripts (70 members)
- Documentation modules (6 members)
- Documentation templates (15 members)
- Example images (4 members)
- Experimental (50 members)
- Extensions (1 member)
- FANDOM Engineering (35 members)
- Failing Lua test suites (11 members)
- Fandom Developers Wiki (53 members)
- Files (1 member)
- Formatting templates (3 members)
- Forums (17 members)
- General wiki modules (3 members)
- General wiki templates (33 members)