The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Statesians of Irish descent (4 members)
- Statesians of Italian descent (4 members)
- Statesians of Polish descent (2 members)
- Statesians of Scotch-Irish descent (2 members)
- Statesians of Scottish descent (5 members)
- Statues (9 members)
- Strike waves (1 member)
- Strikes (1 member)
- Stubs (383 members)
- Study guides (2 members)
- Study notes (3 members)
- Subreddits (5 members)
- Suppression of dissent (11 members)
- Tanzania (1 member)
- Targets of bourgeois media (12 members)
- Targets of censorship (24 members)
- Targets of corporate media attacks (0 members)
- Targets of imperialism (8 members)
- Targets of intelligence operations (15 members)
- Targets of regime change operations (12 members)
- Technology (2 members)
- Telegram Group (1 member)
- Template documentation pages (1 member)
- Templates (1 member)
- Templates using TemplateData (1 member)
- Terrorism (1 member)
- The Compatible Left (11 members)
- Thematic maps (2 members)
- Theologians (2 members)
- Theories of history (1 member)
- Theory (essays) (1 member)
- Think tanks (5 members)
- Time zone maps (1 member)
- Timelines (1 member)
- To-do lists (2 members)
- Trade unionists (1 member)
- Trade unions (6 members)
- Trade unions by country (1 member)
- Trade unions in the United States (6 members)
- Trans comrades (0 members)
- Transgender Warriors (0 members)
- Transhumanism (1 member)
- Trotskyism (9 members)
- Trotskyist organisations (8 members)
- Trotskyists (3 members)
- Trumpism (1 member)
- U-S-U work (1 member)
- U.S government collaborators (1 member)
- UN resolutions (3 members)
- US-backed coups (1 member)