The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Album articles lacking alt text for covers (3 members)
- Album chart usages for Billboard200 (2 members)
- Album chart usages for Finland (1 member)
- Album chart usages for Sweden (1 member)
- Album chart usages for UK (1 member)
- AllMusic template missing ID and not in Wikidata (1 member)
- All articles with dead external links (1 member)
- All pages needing cleanup (1 member)
- All redirect categories (3 members)
- Andrew W.K. albums (4 members)
- Andrew W.K. songs (1 member)
- Article message templates (1 member)
- Article message templates with missing parameters (1 member)
- Articles with dead external links from July 2021 (1 member)
- Articles with hAudio microformats (3 members)
- Articles with hCards (1 member)
- Articles with invalid date parameter in template (1 member)
- Articles with permanently dead external links (1 member)
- Articles with short description (4 members)
- CatAutoTOC generates no TOC (2 members)
- CatAutoTOC on pages where PAGESINCATEGORY returns zero (2 members)
- Commons category link is the pagename (1 member)
- Disambiguation and redirection templates (1 member)
- Documentation header templates (1 member)
- Documentation see also templates (1 member)
- Encyclopedia external link templates (1 member)
- Hatnote templates (1 member)
- Hidden categories (3 members)
- Internal template-link templates (13 members)
- Interviews (2 members)
- Lore (3 members)
- Lua-based templates (14 members)
- Metacritic ID not in Wikidata (1 member)
- Miscellaneous redirects (16 members)
- Music infobox templates (1 member)
- Music infoboxes with Module:String errors (2 members)
- Navboxes using background colours (3 members)
- Navigational boxes without horizontal lists (1 member)
- Official website missing URL (1 member)
- Pages used in system messages needing protection (1 member)
- Pages using Timeline (1 member)
- Pages using duplicate arguments in template calls (18 members)
- Pages using infobox artist discography with unknown parameters (1 member)
- Pages using infoboxes with thumbnail images (1 member)
- Pages using xtag template with unsupported tag name (1 member)
- Pages with TemplateStyles errors (2 members)
- Pages with broken file links (20 members)
- Pages with reference errors (2 members)
- Pages with script errors (22 members)
- Pages with template loops (2 members)