The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- 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)