The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Templates using Toolforge (1 member)
- Templates with no visible output (1 member)
- Templates with partial table wikitext (1 member)
- Temporal templates (1 member)
- Text-specific formatting and function templates (3 members)
- Text color templates (14 members)
- Time, date and calendar templates (1 member)
- Time and date maintenance templates (3 members)
- Top-level categories (7 members)
- Top icon protection templates (1 member)
- Traveling merchants (1 member)
- Typing-aid templates (11 members)
- Unified table cell templates (1 member)
- Unprintworthy redirects (2 members)
- Usable Materials (1 member)
- Useful templates (12 members)
- User interface language dependent templates (1 member)
- User namespace templates (1 member)
- Userboxes (1 member)
- Username internal link templates (1 member)
- Village Management (3 members)
- WikiProject Redirect templates (3 members)
- Wiki administration (11 members)
- Wikicode string manipulation templates (1 member)
- Wikidata modules (1 member)
- Wikipedia-internal sidebar templates (1 member)
- Wikipedia XHTML tag-replacing templates (15 members)
- Wikipedia article titles (1 member)
- Wikipedia articles containing placeholders (2 members)
- Wikipedia button templates (2 members)
- Wikipedia counter-vandalism tools (1 member)
- Wikipedia editing-related user templates (1 member)
- Wikipedia formatting and function templates (6 members)
- Wikipedia help templates (1 member)
- Wikipedia magic word templates (11 members)
- Wikipedia metatemplates (11 members)
- Wikipedia page-section templates (2 members)
- Wikipedia pages with incorrect protection templates (2 members)
- Wikipedia section templates (1 member)
- Wikipedia see also (1 member)
- Wikipedia substituted templates (4 members)
- Wikipedia table of contents templates (2 members)
- Wikipedia templates needing cleanup (2 members)
- Wikipedia templates to be automatically substituted (2 members)
- Wikipedia transclusionless templates (9 members)
- Wikipedia utility modules (1 member)
- Wikipedia utility templates (7 members)
- Wikitext processing templates (3 members)
- Wikitext typing-aid templates (21 members)
- Workaround templates (3 members)