The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- (DT)Ecology (14 members)
- (DT)Energy (10 members)
- (DT)Governance (2 members)
- (DT)Management (2 members)
- (DT)Shipping (6 members)
- (NS)Currents (1 member)
- (NS)Ecology (28 members)
- (NS)Energy (14 members)
- (NS)Governance (12 members)
- (NS)Shipping (13 members)
- ExampleCategory (2 members)
- ExcludeFromList (4 members)
- External link templates (1 member)
- Food infobox templates (1 member)
- Hatnote modules (1 member)
- Infobox templates (1 member)
- Internal category-link templates (3 members)
- Intricate templates (1 member)
- Lua-based templates (4 members)
- Lua metamodules (3 members)
- 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)
- Pages using duplicate arguments in template calls (2 members)
- Pages with broken file links (1,103 members)
- Pages with ignored display titles (1 member)
- Pages with non-numeric formatnum arguments (1 member)
- Pages with script errors (26 members)
- Ship templates (1 member)
- TemplateData documentation (2 members)
- Template documentation pages (4 members)
- Templates generating ADR microformats (1 member)
- Templates generating hRecipe (1 member)
- Templates generating microformats (1 member)
- Unfinished (1 member)
- Water transport infobox templates (1 member)
- Wikipedia infoboxes (1 member)
- Wikipedia metatemplates (2 members)
