The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- BMW R 1200 GS (231 members)
- BMW R 80/7 (11 members)
- Baby Album (50 members)
- Basics (FAQ) (24 members)
- Becky Chambers (1 member)
- Beer (23 members)
- Bibliographies (5 members)
- Biographical templates usable as a module (1 member)
- Biographies (5 members)
- Black Lives Matter (38 members)
- Bokeh Panoramas (23 members)
- Books (104 members)
- Boris Pasternak (1 member)
- Bourbon (9 members)
- Broken templates (1 member)
- Bruce Sterling (3 members)
- CORVIC-19 (1 member)
- COVID-19 (624 members)
- COVID 19 (1 member)
- CS1 maint: Date format (1 member)
- CV (13 members)
- Calendar templates (1 member)
- Cameras 📷 (8 members)
- Canon 1.2/85 EF (5 members)
- Canon 1.2/85 FD (30 members)
- Canon 1.4/50 FD (8 members)
- Canon 1.4/50 LTM (40 members)
- Canon 1.8/85 EF (2 members)
- Canon 1.8/85 FD (6 members)
- Carl Sagan (5 members)
- Carl Sandberg (1 member)
- Carlos Fuentes (1 member)
- Cars (53 members)
- Cassarit 2.8/50 (8 members)
- Category namespace templates (1 member)
- Cats (11 members)
- Charles Bukowski (1 member)
- Charles Stross (1 member)
- Chart formatting templates (1 member)
- Chaucer (2 members)
- Children (8 members)
- Chuck Mangione (2 members)
- Cityscapes (66 members)
- Classical (1 member)
- Collapse templates (1 member)
- College (4 members)
- Color-Skopar 3.5/21 (10 members)
- Community (3 members)
- CompFAQ (17 members)
- Composition (43 members)