The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Communist parties by country (3 members)
- Communists (14 members)
- Communists by nationality (1 member)
- Concepts (12 members)
- Conferences (3 members)
- Conservatism in the United States (1 member)
- Corporate media (2 members)
- Corruption (1 member)
- Corruption by country (1 member)
- Corruption in the United States (1 member)
- Counterpropaganda (1 member)
- Countries (12 members)
- Criminal organizations (1 member)
- Critiques of Slavoj Žižek (2 members)
- Cultural theory (2 members)
- DPRK study guides (1 member)
- Dark money (1 member)
- Debates (1 member)
- Debt (1 member)
- Deep state (1 member)
- Degrowth (1 member)
- Delete (4 members)
- Digitalization (1 member)
- Disambiguation pages (1 member)
- Dual power (1 member)
- Dystopia (1 member)
- Economists (3 members)
- Elections (1 member)
- Environmental disasters (1 member)
- Eurasianism (2 members)
- Events (7 members)
- FAQs (1 member)
- Fascism (1 member)
- Fascists (1 member)
- Film lists (1 member)
- Films (1 member)
- Financial industry (1 member)
- Forms of warfare (1 member)
- Geopolitics (2 members)
- German idealism (2 members)
- Glows (1 member)
- Good Articles (7 members)
- Great reset (1 member)
- Groups (1 member)
- Gus Hall (1 member)
- Hashtags (1 member)
- Heads of State (2 members)
- Heads of state (5 members)
- Historians (1 member)
- Historians by nationality (1 member)