The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Administration of this site (7 members)
- Article management tags (1 member)
- Article stubs (4 members)
- Articles in other languages (7 members)
- BlogListingPage (0 members)
- Blog posts (15 members)
- Bracketing (5 members)
- Browse (9 members)
- Bulgarian (12 members)
- Bullet Time (1 member)
- CC-BY-SA files (1 member)
- CC-BY files (4 members)
- CC-SA files (2 members)
- CHDK (57 members)
- CHDK-Talk (9 members)
- CHDK internals (15 members)
- CHDK on MAC (2 members)
- CHDK usage (2 members)
- CHDK usage(Simplified Chinese) (0 members)
- Camcorders (7 members)
- Cameras (272 members)
- Candidates for deletion (1 member)
- CanonBasic (12 members)
- Canon 1000 (1 member)
- Chinese (1 member)
- Community (3 members)
- Conditional copyrighted free use files (21 members)
- Copyright (2 members)
- Copyright tags (12 members)
- Copyrighted free use files (1 member)
- DEBUG (5 members)
- DSLR (17 members)
- Date calculation templates (4 members)
- Developers (10 members)
- Development (352 members)
- Digic 6 (13 members)
- Digic 7 (2 members)
- DryOS (4 members)
- EventProcedure (3 members)
- Events (1 member)
- Fair use files (6 members)
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- Firmware (9 members)
- Focus (1 member)
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- Forums (6 members)
- French (10 members)
- G1XMk2 (1 member)
- GFDL files (12 members)