The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Socialist Space Programs (1 member)
- Socialist art (2 members)
- Socialist intelligence agencies (4 members)
- Socialist leaders (2 members)
- Socialist media outlets (17 members)
- Socialist newspapers (22 members)
- Socialist podcasts (17 members)
- Socialist political parties (10 members)
- Socialist realism (3 members)
- Socialist rulers (8 members)
- Socialist states (7 members)
- Socialists (18 members)
- Socialists by nationality (3 members)
- Sociology (2 members)
- Software (4 members)
- Soldiers (2 members)
- Solzhenitsyn family (1 member)
- Song lyrics (30 members)
- South Korea (0 members)
- Soviet Union (4 members)
- Soviet Union navigational boxes (1 member)
- Soviet Union portal (3 members)
- Soviet agronomists (1 member)
- Soviet anti-USA posters (6 members)
- Soviet anti-fascist posters (1 member)
- Soviet military personnel of the Russian Civil War (1 member)
- Soviet military personnel of the Spanish Civil War (1 member)
- Soviet politicians (17 members)
- Soviet propaganda posters (37 members)
- Space Programs (1 member)
- Speeches (15 members)
- Speeches by Enver Hoxha (1 member)
- Speeches by Fidel Castro (1 member)
- Speeches by Mao Zedong (1 member)
- Spies (1 member)
- Sports (2 members)
- State bodies (2 members)
- State emblems (2 members)
- State ideologies (3 members)
- State media (6 members)
- State media of anti-imperialist countries (4 members)
- State media of imperialist countries (0 members)
- State media of socialist countries (1 member)
- States (4 members)
- States of India (1 member)
- Statesian Marxists (5 members)
- Statesian anti-communists (1 member)
- Statesian communist parties (14 members)
- Statesian communists (33 members)
- Statesian historians (1 member)
- Statesian journalists (6 members)
- Statesian political prisoners (16 members)
- Statesian politicians (9 members)
- Statesian slave owners (9 members)
- Statesians by descent (9 members)
- Statesians of Belarusian descent (1 member)
- Statesians of Canadian descent (1 member)
- Statesians of English descent (7 members)
- Statesians of French descent (3 members)
- Statesians of German descent (3 members)
- 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 (387 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)