The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Tango project (0 members)
- Tango project/emblems (1 member)
- Taxon categories (13 members)
- Taxonomy (1 member)
- Technology (1 member)
- TemplateData documentation (1 member)
- Template Unknown (artist) (1 member)
- Template Unknown (author) (1 member)
- Template documentation (4 members)
- Template namespace templates (4 members)
- Template redirects (1 member)
- Templates:Unknown (1 member)
- Templates not requiring internationalization (4 members)
- Templates to include in Taxonavigation (1 member)
- Templates using LangSwitch for internationalisation (1 member)
- Templates using TemplateData (4 members)
- Text formatting templates (1 member)
- Time (0 members)
- Toby Fox (1 member)
- Tool icons (1 member)
- Topics (2 members)
- Topics (flat list) (1 member)
- Translated documentation templates (5 members)
- Translated header templates (6 members)
- Translated license tags (1 member)
- Translated marker templates (4 members)
- Translated navigational templates (1 member)
- Translation done (2 members)
- Turn-based RPGs (1 member)
- Typing-aid templates (1 member)
- User page images (1 member)
- Uses of Autocat template (2 members)
- Uses of the Internet (1 member)
- Using (1 member)
- Valid SVG created with Inkscape:Gnome icons (1 member)
- Valued image templates (1 member)
- Video game companies of Japan (1 member)
- Video game composers (1 member)
- Video game development (1 member)
- Video game platforms by company (1 member)
- Video games by name (2 members)
- Video games by type (1 member)
- Video games developed in Sweden (1 member)
- Video games developed in the United States (1 member)
- Video games in the Museum of Modern Art (1 member)
- Vulpes (1 member)
- Vulpes vulpes (0 members)
- Vulpini (1 member)
- Wii U games by name (1 member)
- Window managers (1 member)