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The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- History of Vietnam (3 members)
- History of Xi'an (1 member)
- History of labor relations in the United States (2 members)
- History of the Soviet Union (9 members)
- History of the UK (3 members)
- History of the USA (15 members)
- History portals (3 members)
- Ho Chi Minh (2 members)
- Holidays (3 members)
- Honorary Citizens of Paris (1 member)
- Honorary Citizens of the United States (1 member)
- Honorary Fellows of the British Academy (1 member)
- Housing projects (1 member)
- Housing rights (1 member)
- How tos (essays) (5 members)
- Hoxhaism (11 members)
- Hoxhaist organisations (6 members)
- Hungarian anti-fascists (1 member)
- Hungarian communists (1 member)
- IMF people (1 member)
- I Ain't Marching Anymore (4 members)
- Idealism (15 members)
- Idealist philosophers (1 member)
- Ideological conflicts (1 member)
- Ideological infrastructure (26 members)
- Ideology of the Communist Party of China (6 members)
- Ideology of the Communist Party of the Soviet Union (1 member)
- Ideology of the Democratic People's Republic of Korea (1 member)
- If I Had a Hammer: Songs of Hope and Struggle (1 member)
- Illegal states (5 members)
- Images (13 members)
- Imperial Russian Army personnel (1 member)
- Imperialism (21 members)
- Imperialist companies (23 members)
- Imperialist countries (30 members)
- Imperialist intergovernmental organizations (9 members)
- Imperialist organizations (22 members)
- Imperialist political parties (17 members)
- Imperialist propaganda (30 members)
- Imperialist secret police (11 members)
- Imperialist tactics (1 member)
- Imperialist think tanks (3 members)
- Imperialist treaties (1 member)
- Imperialist wars (1 member)
- Imperialists (22 members)
- Incomplete (0 members)
- Incomplete library works (14 members)
- Indian Marxists (7 members)
- Indian revolutionaries (1 member)
- Indigenous People of the Americas (2 members)