The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Peasant Uprisings (4 members)
- Peasants (1 member)
- People (1 member)
- Peru (3 members)
- Peter Gelderloos (6 members)
- Peter Kropotkin (3 members)
- Philippines (2 members)
- Philosophers (5 members)
- Philosophy (1 member)
- Physics (2 members)
- Poets (1 member)
- Poland (7 members)
- Police Corruption (2 members)
- Political Parties (1 member)
- Political ideologies (1 member)
- Political theories (3 members)
- Portugal (1 member)
- Prisons (1 member)
- Privatization (1 member)
- Propaganda of the Deed (2 members)
- Property (1 member)
- Protest Waves (1 member)
- Psychedelics (1 member)
- Psychologists (2 members)
- Psychology (1 member)
- Puerto Rico (2 members)
- Queer Activists (1 member)
- Queer Issues (1 member)
- Queerphobia (2 members)
- Quests (2 members)
- Race Riots (1 member)
- Racism (6 members)
- Red Terrors (1 member)
- Religions (8 members)
- Reproductive Rights (2 members)
- Republic of the Congo (1 member)
- Resistance Movements (1 member)
- Restorative Justice (1 member)
- Revoluntary Waves (4 members)
- Revolutionary Spain (2 members)
- Revolutionary Waves (4 members)
- Revolutions (33 members)
- Revolutions of 1848 - 1871 (1 member)
- Revolutions of 1905 - 1911 (1 member)
- Revolutions of 1916 - 1923 (4 members)
- Revolutions of 1967 - 1975 (4 members)
- Revolutions of 1968 - 1975 (2 members)
- Revolutions of 1986 - 1992 (3 members)
- Revolutions of 1986 - 1993 (1 member)
- Revolutions of 1989 - 1992 (1 member)