The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 1997 Episodes (3 members)
- 2001 (1 member)
- 2003 (1 member)
- 2010 Episodes (1 member)
- Absences (4 members)
- Active Talk Pages (1 member)
- Actresses (1 member)
- Adults (35 members)
- African-Americans (4 members)
- Albums (2 members)
- All In A Day's Work transcripts (1 member)
- Animals (9 members)
- Article management templates (5 members)
- Article stubs (39 members)
- Bad Dreams (1 member)
- Bald-headed (1 member)
- Bald-headed Characters (0 members)
- Bald-headed characters (0 members)
- Banned Episodes (15 members)
- Banned episodes (0 members)
- Birthday Episodes (2 members)
- Blacks (13 members)
- Blog posts (24 members)
- Book galleries (1 member)
- Books (8 members)
- Boris Fans (2 members)
- Boris Haters (1 member)
- Born 1992 (1 member)
- Born 1993 (1 member)
- Born in 1960s (1 member)
- Borns in 1950's (1 member)
- Boys (14 members)
- British American (1 member)
- Browse (6 members)
- Bullying (2 members)
- Caillou (2 members)
- Caillou's Neighbors (1 member)
- Caillou's Playschool Class (18 members)
- Caillou (2024) Episodes (26 members)
- Caillou (2024) Season 1 Episodes (26 members)
- Caillou Fans (4 members)
- Caillou Games (3 members)
- Caillou Home Videos (6 members)
- Caillou Videos (4 members)
- Caillou misbehaving (4 members)
- Candidates for deletion (12 members)
- Candidates for speedy deletion (0 members)
- Category templates (4 members)
- Cats (1 member)
- Censored Episodes (2 members)