The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Public domain images (3 members)
- Public domain images ineligible for copyright (shape) (1 member)
- Red, White and Bruised: The Midnight Live (2 members)
- Related-topic templates (1 member)
- Releases (12 members)
- Remixes (20 members)
- Restriction tags (1 member)
- Scribunto modules with errors (15 members)
- Self-published work (276 members)
- Semantic markup templates (2 members)
- Sidebars with styles needing conversion (1 member)
- Singles (28 members)
- Site (1 member)
- Software media templates (2 members)
- Software templates (2 members)
- Somecat (2 members)
- Somecat1 (2 members)
- Somecat2 (2 members)
- Somecat3 (2 members)
- Song articles with both composer and songwriter (104 members)
- Song articles with both lyricist and songwriter (104 members)
- Songs (106 members)
- Spring 2019 Tour Photos (30 members)
- Structured Data on Commons templates (1 member)
- Syndicate (14 members)
- TV Videos (57 members)
- Table templates (1 member)
- Talk message boxes (1 member)
- Television templates (2 members)
- TemplateData documentation (1 member)
- TemplateStyles stylesheets with errors (1 member)
- Template documentation pages (91 members)
- Template namespace templates (2 members)
- Templates based on the Citation/CS1 Lua module (1 member)
- Templates based on the Infobox Lua module (1 member)
- Templates generating COinS (3 members)
- Templates generating hAudio microformats (5 members)
- Templates generating hCalendars (4 members)
- Templates generating hCards (6 members)
- Templates generating microformats (1 member)
- Templates not safe for use in citation templates (1 member)
- Templates that add a tracking category (22 members)
- Templates that generate named references (1 member)
- Templates that generate short descriptions (5 members)
- Templates tracking Wikidata (1 member)
- Templates used by AutoWikiBrowser (1 member)
- Templates used by Twinkle (1 member)
- Templates using TemplateData (43 members)
- Templates using TemplateStyles (10 members)
- Templates using an unknown approach for internationalisation (1 member)