The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Lua-based templates (4 members)
- Lua metamodules (3 members)
- Macrobenthos (1 member)
- Microformat (uF) message templates (2 members)
- Military ship infobox templates (1 member)
- Modules for image handling (1 member)
- Modules subject to page protection (11 members)
- Modules that add a tracking category (6 members)
- Modules using data from Wikidata (1 member)
- Natural resources (2 members)
- Pages using DynamicPageList (2 members)
- Pages using duplicate arguments in template calls (3 members)
- Pages with broken file links (1,133 members)
- Pages with ignored display titles (1 member)
- Pages with non-numeric formatnum arguments (1 member)
- Pages with script errors (26 members)
- Pressure (4 members)
- Protected areas (17 members)
- Recreational (17 members)
- Ship templates (1 member)