The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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)
- Update what links here (3 members)