The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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)
- Text formatting templates (13 members)
- Time and date maintenance templates (2 members)
- Title review (1 member)
- Top Bar (3 members)
- Tracking templates (1 member)
- Traffic sign (5 members)
- Transcludable pages (15 members)
- Translation (3 members)
- Translation candidates (0 members)
- Turn (9 members)
- Typing-aid templates (15 members)
- UR Responses (1 member)
- USA (182 members)
- USA To Do (8 members)
- USA specific category.png (1 member)
- Unused template (1 member)
- UpdateImage (5 members)
- Update required (0 members)
- Update to State template (0 members)