The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Pages with broken file links (602 members)
- Pages with reference errors (2 members)
- Pages with script errors (635 members)
- Pages with short description (122 members)
- Paralympics task force (1 member)
- People (25 members)
- People and person infobox templates (5 members)
- Polaroids (554 members)
- Positioning templates (1 member)
- Protection templates (1 member)
- Public domain copyright templates (1 member)
- Public domain images (3 members)
- Public domain images ineligible for copyright (shape) (1 member)
- Red, White and Bruised: The Midnight Live (1 member)
- Related-topic templates (1 member)
- Releases (13 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 (24 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 (87 members)
- Song articles with both lyricist and songwriter (87 members)
- Songs (87 members)
- Spring 2019 Tour Photos (30 members)
- Structured Data on Commons templates (1 member)
- 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)
- Templates using data from Wikidata (3 members)
- Templates using the Wikipedia license migration system (3 members)
- Test cases using output parameter (2 members)
- Text-specific formatting and function templates (2 members)
- The Midnight Accessories (33 members)
- The Midnight Apparel (76 members)
- The Midnight Merchandise (149 members)
- The Midnight Outerwear (16 members)
- The Midnight Physical Releases (2 members)
- The Midnight Posters (22 members)
- The Midnight Prints (5 members)
- The Midnight Shadows (22 members)
- The Midnight Shirts (56 members)
- The Midnight Tour Posters (16 members)
- Ticker symbol templates (1 member)
- Top icon protection templates (3 members)
- Topic-specific metatemplates (2 members)
- Tour posters (1 member)
- Tours (12 members)
- Track listings with input errors (1 member)
- Transwiki guide (2 members)
- Typing-aid templates (3 members)
- Video game media templates (2 members)
- Videos (58 members)
- Websites templates (1 member)
- WikiProject Albums templates (3 members)
- WikiProject Musicians templates (5 members)
- WikiProject Olympics (2 members)
- WikiProject Scouting templates (1 member)
- WikiProject Short descriptions (1 member)
- WikiProject Songs templates (2 members)
- Wikidata templates (1 member)
- Wikipedia administration templates (1 member)
- Wikipedia citation administration (1 member)
- Wikipedia editor help (1 member)
- Wikipedia file copyright templates (1 member)
- Wikipedia files tagged as own work (277 members)
- Wikipedia fully protected files (4 members)
- Wikipedia indefinitely move-protected pages (4 members)
- Wikipedia infoboxes (1 member)