The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Revisionists (14 members)
- Revolution (1 member)
- Revolutionaries (26 members)
- Revolutionaries by nationality (4 members)
- Revolutionary Base Area (1 member)
- Revolutionary tactics (1 member)
- Revolutions (9 members)
- Right-wing ideologies (22 members)
- Right wing political parties (4 members)
- Rockefeller family (1 member)
- Rodney family of Delaware (1 member)
- Rulers of England (1 member)
- Russian Marxists (10 members)
- Russian agronomists (1 member)
- Russian state media (2 members)
- Russians (6 members)
- Russians by descent (3 members)
- Russians of Ukrainian descent (4 members)
- SACP comrades (0 members)
- STFU imperialist memes (2 members)