The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Internal link templates (1 member)
- Internationalization templates (1 member)
- Languages pages (6 members)
- Languages pages without translations (6 members)
- List formatting and function templates (1 member)
- Lua-based templates (6 members)
- Modules (1 member)
- Modules for general use (8 members)
- Modules for image handling (1 member)
- Modules subject to page protection (15 members)
- Modules that add a tracking category (5 members)
- Modules that check for strip markers (3 members)
- Modules using data from Wikidata (1 member)
- Navigational boxes without horizontal lists (2 members)
- Pages used in system messages needing protection (12 members)
- Pages using xtag template with unsupported tag name (3 members)
- Pages with broken file links (290 members)
- Pages with incorrect protection templates (19 members)
- Pages with reference errors (2 members)
- Pages with script errors (8 members)
- Pages with syntax highlighting errors (13 members)
- Pages with template loops (1 member)
- Pages with templates in the wrong namespace (1 member)
- Pages with too many expensive parser function calls (2 members)
- Quotation templates (1 member)
- Redirects from merges (3 members)
- Redirects from moves (23 members)
- Semantic markup templates (2 members)
- Sidebar meta-templates (1 member)
- Sidebars with styles needing conversion (1 member)
- Template documentation pages (8 members)
- Template namespace templates (1 member)
- Templates based on the Citation/CS1 Lua module (2 members)
- Templates based on the Infobox Lua module (1 member)
- Templates based on the String Lua module (2 members)
- Templates generating COinS (3 members)
- Templates generating microformats (1 member)
- Templates that add a tracking category (2 members)
- Templates used by AutoWikiBrowser (1 member)
- Templates using TemplateData (3 members)
- Templates using TemplateStyles (11 members)
- Typing-aid templates (3 members)
- Wikimedia UI icons (1 member)
- Wikipedia XHTML tag-replacing templates (1 member)
- Wikipedia authority control (1 member)
- Wikipedia infoboxes (1 member)
- Wikipedia metatemplates (1 member)
- Wikipedia pages with incorrect protection templates (15 members)
- Wikipedia pages with strange ((documentation)) usage (3 members)
- Wikipedia substituted templates (3 members)