The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Escape character templates (14 members)
- Examples (2 members)
- Expand template documentation (3 members)
- Florida (0 members)
- Formatting and function templates (1 member)
- Formatting templates (13 members)
- ForumLink using Community (37 members)
- Forum badges (9 members)
- Forum templates (2 members)
- Freeway (1 member)
- GR (0 members)
- Gas Station (5 members)
- Georgia (0 members)
- Global (2 members)
- Global image archive (6 members)
- Graphic templates (2 members)
- Graphics templates (1 member)
- Great Lakes (1 member)
- Guam (1 member)
- Guideline properties (16 members)
- Hatnote templates (5 members)
- Hatnote templates documentation (1 member)
- Hawaii (1 member)
- Hidden categories (3 members)
- Hidden tags (25 members)
- IPhone (1 member)
- IPhone Instructions (0 members)
- ISO date templates (1 member)
- Icons (14 members)
- Idaho (1 member)
- Illinois (3 members)
- Image required (9 members)
- Image templates (1 member)
- Images (2 members)
- Improper wiki style (0 members)
- Incomplete templates (19 members)
- Index (23 members)
- Indexed pages (2 members)
- Indiana (2 members)
- Indonesia (0 members)
- Info required (7 members)
- Infobox templates (3 members)
- Inline cleanup templates (1 member)
- Inline templates (5 members)
- Interface templates and forms (3 members)
- Internal link maintenance templates (2 members)
- Internal link templates (10 members)
- Iowa (1 member)
- JP (6 members)
- Junction (13 members)