The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Biography with signature (0 members)
- Box modules (2 members)
- Box templates (1 member)
- Brand merchandise (85 members)
- CS1 location test (2 members)
- CS1 maint: unrecognized language (2 members)
- Candidates for deletion (0 members)
- Candidates for speedy deletion (0 members)
- Candidates for speedy deletion by user (0 members)
- Carnival of Rust Merchandise (0 members)
- Carnival of Rust merchandise (4 members)
- Character-substitution templates (3 members)
- Character templates (1 member)
- Characters (7 members)
- Checkmark insertion templates (1 member)
- Citation Style 1 templates (3 members)
- Citation Style 2 templates (1 member)
- Clearview Merchandise (0 members)
- Clearview merchandise (12 members)
- Collapse templates (6 members)
- Color templates (2 members)
- Community (2 members)
- Community images (3 members)
- Compilation albums (3 members)
- Computer keys (1 member)
- Content (8 members)
- Conversion templates (1 member)
- Convert-like templates (0 members)
- Convert by module documentation (1 member)
- Convert errors (0 members)
- Cross-reference templates (3 members)
- Date-computing templates (3 members)
- Date-computing templates based on current time (3 members)
- Date mathematics templates (3 members)
- Date of birth not in Wikidata (0 members)
- De (1 member)
- De-N (1 member)
- Disambiguation and redirection hatnote templates (1 member)
- Disambiguation and redirection templates (1 member)
- Disambiguation pages (10 members)
- Discography (11 members)
- Documentation (6 members)
- Documentation assistance templates (2 members)
- Documentation header templates (3 members)
- Documentation see also templates (1 member)
- Documentation shared content templates (1 member)
- Documentation subpages without corresponding pages (2 members)
- Documentation templates (4 members)
- Duration with input error (2 members)
- Duration without hAudio microformat (4 members)