The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- (NS)Energy (14 members)
- (NS)Governance (11 members)
- (NS)Shipping (11 members)
- Aquaculture (5 members)
- Biodiversity indicator (2 members)
- Birds and mammals (6 members)
- Cables and pipelines (10 members)
- Energy (14 members)
- Environmental conditions (12 members)
- ExampleCategory (2 members)
- ExcludeFromList (4 members)
- External link templates (1 member)
- Fish (10 members)
- Fishing (14 members)
- Food infobox templates (1 member)
- Governance (11 members)
- Hatnote modules (1 member)
- Infobox templates (1 member)
- Internal category-link templates (3 members)
- Intricate templates (1 member)