The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Talk message boxes (1 member)
- Talk namespace templates (2 members)
- Television-related modules (1 member)
- Television infobox templates (1 member)
- TemplateData (1 member)
- Template Convert (1 member)
- Template documentation (12 members)
- Template documentation pages (183 members)
- Template implementation details (4 members)
- Template metamodules (6 members)
- Template namespace templates (7 members)
- Templates (158 members)
- Templates based on the Infobox Lua module (1 member)
- Templates based on the String Lua module (9 members)
- Templates for discussion templates (1 member)
- Templates for merging (2 members)
- Templates for soft redirects (0 members)
- Templates generating hAtom (1 member)
- Templates generating hAudio microformats (3 members)
- Templates generating hCalendars (5 members)
- Templates generating hCards (3 members)
- Templates generating microformat date and age (1 member)
- Templates generating microformats (2 members)
- Templates needing substitution checking (2 members)
- Templates that add a tracking category (24 members)
- Templates that are not mobile friendly (1 member)
- Templates that generate named references (1 member)
- Templates that generate short descriptions (4 members)
- Templates tracking Wikidata (1 member)
- Templates using TemplateData (64 members)
- Templates using TemplateStyles (26 members)
- Templates using TemplateStyles with a different protection level (2 members)
- Templates using TemplateStyles without padlocks (7 members)
- Templates with no visible output (1 member)
- Templates with partial table wikitext (2 members)
- Temple of Thought Merchandise (0 members)
- Temple of Thought merchandise (7 members)
- Text-specific formatting and function templates (4 members)
- Text color templates (5 members)
- Thematics (12 members)
- Time, date and calendar modules (1 member)
- Top icon protection templates (1 member)
- Top level category (3 members)
- Tour images (14 members)
- Tour posters (3 members)
- Tours (16 members)
- Track listings that use the collapsed parameter (0 members)
- Track listings with deprecated parameters (0 members)
- Track listings with input errors (0 members)
- Tracking templates (1 member)