The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Review Purpose (1 member)
- Review redirects (18 members)
- Review section headings (1 member)
- Revision (30 members)
- Rhode Island (2 members)
- Road Type (11 members)
- Road Type templates (24 members)
- Road types and names (0 members)
- Runway/Taxiway (1 member)
- Sample responses (14 members)
- Script Subpage (49 members)
- Search (2 members)
- Search templates (2 members)
- Segment (4 members)
- South Carolina (1 member)
- South Dakota (1 member)
- Southeast (1 member)
- Street (1 member)
- String manipulation templates (2 members)
- Style guides (58 members)
- Sv (0 members)
- Sv-0 (0 members)
- TW (0 members)
- Table examples (11 members)
- Table formatting issue (3 members)
- Table formatting templates (1 member)
- Template:Documentation (9 members)
- Template:Mbox (31 members)
- TemplateData documentation (28 members)
- Template documentation (1 member)
- Template documentation cleanup (5 members)
- Template documentation pages (193 members)
- Template lists (1 member)
- Template management (11 members)
- Templates (58 members)
- Templates for or part of the state template (108 members)
- Templates generating hAtom (1 member)
- Templates generating hCalendars (1 member)
- Templates generating hCards (1 member)
- Templates needing attention (6 members)
- Templates not transcluded as of 2016-08 (22 members)
- Templates using ParserFunctions (1 member)
- Templates using TemplateData (1 member)
- Templates with print versions (1 member)
- Temporal templates (1 member)
- Temporary (1 member)
- Tennessee (1 member)
- TestState (1 member)
- Texas (1 member)
- Text Formatting Templates (1 member)