The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Industrial Workers of the World (1 member)
- Industrial policies (1 member)
- Infoboxes without native name language parameter (8 members)
- Informational essays (2 members)
- Infrastructure projects (1 member)
- Instruments of the bourgeoisie (3 members)
- Insurgencies (1 member)
- Intelligence Operations (9 members)
- Intelligence agencies (2 members)
- Intelligence operations (1 member)
- Intergovernmental organizations (15 members)
- International Auxiliary Languages (0 members)
- International Communist Organisations (0 members)
- International auxiliary languages (2 members)
- International communist organizations (10 members)
- International socialist organizations (1 member)
- Interviews (10 members)
- Iran (2 members)
- Iran memes (1 member)
- Iranian state media (1 member)