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)