The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Chinese politicians (5 members)
- Chinese propaganda posters (15 members)
- Chinese revolutionaries (1 member)
- Chinese state media (2 members)
- Christianity (7 members)
- Cities (22 members)
- City-states (1 member)
- Civil rights (2 members)
- Civil wars (6 members)
- Class society (5 members)
- Class warfare memes (1 member)
- Classical economists (3 members)
- Climate change (1 member)
- Closed source software (1 member)
- Coats of arms (1 member)
- Cold War (5 members)
- Colonial outposts (9 members)
- Colonialism (7 members)
- Colour Revolutions (5 members)
- Comintern (1 member)
- Commonwealth of Nations templates (1 member)
- Communes (1 member)
- Communism (11 members)
- Communism navigational boxes (1 member)
- Communist Discord communities (8 members)
- Communist Party USA (4 members)
- Communist Party of Canada comrades (0 members)
- Communist Party of China (24 members)
- Communist Party of China templates (1 member)
- Communist Party of India comrades (0 members)
- Communist Party of Vietnam (2 members)
- Communist Party of the Soviet Union (1 member)
- Communist Tiktok artists (1 member)
- Communist YouTube channels (40 members)
- Communist YouTubers (0 members)
- Communist ideologies (7 members)
- Communist leaders (22 members)
- Communist magazines (3 members)
- Communist parties (266 members)
- Communist parties by country (2 members)
- Communist political candidates (10 members)
- Communist societies (1 member)
- Communist subreddits (1 member)
- Communist symbols (3 members)
- Communist underground movements (8 members)
- Communist youth organizations (3 members)
- Communists (54 members)
- Communists by country (7 members)
- Communists by party (5 members)
- Community organization (1 member)
- Companies (6 members)
- Companies based in the United States (10 members)
- Companies targeted by BDS (4 members)
- Computer operating systems (2 members)
- Computing (7 members)
- Comrades (0 members)
- Comrades by organization (12 members)
- Comrades by region (5 members)
- Comrades from Africa (0 members)
- Comrades from Asia (0 members)
- Comrades from Australia (0 members)
- Comrades from Europe (3 members)
- Comrades from North America (3 members)
- Comrades from Oceania (1 member)
- Comrades from South America (0 members)
- Comrades from the Americas (2 members)
- Comrades of the RTC (2 members)
- Conflicts (7 members)
- Congresses of the Brazilian Communist Party (1 member)
- Conspiracy theories (5 members)
- Constitutions (8 members)
- Constitutions of the Communist Party of China (10 members)
- Constitutions of the People's Republic of China (1 member)
- Constitutions of the Soviet Union (2 members)
- Continents (8 members)
- Contribute to ProleWiki (6 members)
- Corporate media (1 member)
- Cosmonauts (1 member)
- Countergangs strategy (1 member)
- Counterpropaganda (1 member)
- Counterrevolution (2 members)
- Counterrevolutionaries (10 members)
- Countries (226 members)
- Countries by continent (4 members)
- Countries by ideology (3 members)
- Countries invaded by the United States (23 members)
- Countries sanctioned by the US (8 members)
- Countries targeted by CIA coups (19 members)
- Countries targeted by imperialist aggression (19 members)
- Country data templates of Greece (1 member)
- Country data templates of India (1 member)
- Country data templates of Iran (3 members)
- Country data templates of South Africa (1 member)
- Country data templates of South Korea (2 members)
- Country data templates of cities in the United States (3 members)
- Country data templates of countries (3 members)
- Country data templates of former countries (4 members)
- Country data templates of governments (1 member)
- Country data templates of historical entities (2 members)
- Country data templates of partly recognized states (0 members)