The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- All stub articles (6 members)
- Book citation templates (1 member)
- Book templates (1 member)
- CS1: long volume value (3 members)
- CS1 errors: empty citation (3 members)
- CS1 maint: DOI inactive as of July 2021 (1 member)
- CS1 maint: unrecognized language (3 members)
- Citation Style 1 templates (1 member)
- Definitions (8 members)
- Documentation assistance templates (4 members)
- Hatnote modules (1 member)
- Infobox modules (2 members)
- Lua-based templates (1 member)
- Lua metamodules (2 members)
- Microformat (uF) message templates (2 members)
- Models (6 members)
- Modules for image handling (1 member)
- Modules subject to page protection (13 members)
- Modules that add a tracking category (6 members)
- Modules that check for strip markers (3 members)
- Modules using data from Wikidata (1 member)
- Navigational boxes without horizontal lists (1 member)
- Pages used in system messages needing protection (7 members)
- Pages with TemplateStyles errors (1 member)
- Pages with broken file links (153 members)
- Pages with script errors (23 members)
- Papers (4 members)
- Sidebar meta-templates (1 member)
- Software (3 members)
- Software/GUI (1 member)
- Software/Inference (3 members)
- Software/Training (1 member)
- Stub message templates (1 member)
- Stub message templates needing attention (1 member)
- Stub message templates with documentation subpages (1 member)
- Stub message templates without images (1 member)
- Stubs (6 members)
- TemplateStyles stylesheets with errors (1 member)
- Template documentation (1 member)
- Template documentation pages (4 members)
- Templates based on the Citation/CS1 Lua module (1 member)
- Templates generating COinS (4 members)
- Templates using TemplateData (3 members)
- Test cases using output parameter (1 member)
- Theory (12 members)
- Wikipedia authority control (1 member)
- Wikipedia infoboxes (1 member)
- Wikipedia utility modules (1 member)