The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Market socialism (3 members)
- Marshals of the Soviet Union (6 members)
- Marxian economics (1 member)
- Marxism (19 members)
- Marxism-Leninism (2 members)
- Marxism (essays) (0 members)
- Marxism–Leninism (11 members)
- Marxist-Leninist states (9 members)
- Marxist-Leninists (7 members)
- Marxist economics (10 members)
- Marxist economists (1 member)
- Marxist feminism (3 members)
- Marxist philosophers (2 members)
- Marxist revolutions (1 member)
- Marxist symbols (2 members)
- Marxist terminology (54 members)
- Marxist theorists (6 members)
- Marxist theory (24 members)
- Marxist theory memes (1 member)
- Marxists (25 members)
- Marxists by nationality (4 members)
- Materialism (1 member)
- Matrix Community (1 member)
- May Day (1 member)
- Media (4 members)
- Media outlets (9 members)
- Medieval history (16 members)
- Megacorporations (3 members)
- Members of the Black Panther Party (4 members)
- Members of the Bourgeoisie (0 members)
- Members of the Communist Party USA (0 members)
- Members of the Communist Party of Canada (2 members)
- Members of the Galizien division (1 member)
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- Memes (36 members)
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- Messina templates (1 member)
- Metaphysics (2 members)
- Military Commanders (1 member)
- Military leaders (9 members)
- Military leaders during the English Civil War (1 member)
- Mixed economies (1 member)
- Mode of production (1 member)
- Modes of production (8 members)
- Monarchism (1 member)
- Monarchists (0 members)
- Monarchs (5 members)
- Multipolarity (1 member)
- Music (2 members)
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- Muslims (3 members)
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- National Congresses of the Communist Party of China (2 members)
- National Socialism (1 member)
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- Nazi-collaborators (2 members)
- Nazism (3 members)
- Neo-Nazism (4 members)
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- Neocolonialism (5 members)
- Neoliberalism (9 members)
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- News (4 members)
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- Nicaragua (3 members)
- Nicaraguan revolutionaries (1 member)
- North American countries (11 members)
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- Oil politics (1 member)
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- Organizations (9 members)
- Organizations associated with the Communist Party of China (1 member)
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- Pacifism in the United States (1 member)
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- Pages using infobox organization with motto or pledge (1 member)
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- Pages using infobox person with unknown parameters (0 members)
- Pages using infobox revolutionary with unknown parameters (0 members)
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- Pages with TemplateStyles errors (4 members)
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- Pages with ideological conflicts (3 members)
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- Paintings (22 members)
- Palestine (2 members)
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- Pan-Africanism (1 member)
- Pan-nationalism (1 member)
- Party for Socialism and Liberation (1 member)
- Party of Communists USA (1 member)
- Party of Labour of Albania (1 member)
- Patriotic socialism (3 members)
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- People (24 members)
- People's Republic of China (30 members)
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- People by class (2 members)
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- People by political ideology (16 members)
- People by religion (1 member)
- People critiqued by Lenin (2 members)
- People critiqued by Marx (7 members)
- People from Klagenfurt (1 member)
- People in the United States (4 members)
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- Peruvian socialists (2 members)
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- Philosophers (22 members)
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- Philosophy (15 members)
- Photos of the DPRK (0 members)
- Pictures of bus stops in the DPRK (18 members)
- Pictures of the DPRK (15 members)
- Pictures of the DPRK at night (7 members)
- Pie charts (2 members)
- Pipelines (1 member)
- Places (4 members)
- Plagiarists (1 member)
- Podcasters (2 members)
- Podcasts (16 members)
- Poems (7 members)
- Poems by Langston Hughes (2 members)
- Poems by author (1 member)
- Poets (1 member)
- Pol Pot Atrocities (1 member)
- Police (3 members)
- Police (essays) (1 member)
- Political candidates (3 members)
- Political economists (4 members)
- Political economy (13 members)
- Political ideology (10 members)
- Political movements (2 members)
- Political organizations (3 members)
- Political parties (27 members)
- Political parties by country (0 members)
- Political parties by ideology (3 members)
- Political prisoners (2 members)
- Political prisoners in the United States (0 members)
- Political symbolism (1 member)
- Political terminology (10 members)
- Political theorists (13 members)
- Politicians (39 members)
- Politicians by country (3 members)
- Politicians in Canada (1 member)
- Politicians in the United States (24 members)
- Politics (14 members)
- Politics by country (3 members)
- Politics of Japan (1 member)
- Politics of Russia (1 member)
- Politics of the Soviet Union (1 member)
- Politics of the United States of America (7 members)
- Portals with no named maintainer (2 members)
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- Portraits of leaders (3 members)
- Portraits of people (2 members)
- Posters (0 members)
- Postmodernists (1 member)
- Poverty (3 members)
- Prefectures of Japan (1 member)
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- ProleWiki administrators (2 members)
- ProleWiki comrades (6 members)
- ProleWiki news (essays) (2 members)
- ProleWiki official pages (12 members)
- ProleWiki policies and guidelines (1 member)
- ProleWiki technical contributor (1 member)
- Proletariat (3 members)
- Propaganda (9 members)
- Propaganda posters (17 members)
- Protest tactics (2 members)
- Protests (8 members)
- Province-level administrative divisions (4 members)
- Provinces of China (9 members)
- Proxy wars (1 member)
- Prussian Army personnel (1 member)
- Pseudo-intellectuals (2 members)
- Pseudoscience (3 members)
- Psychiatry (4 members)
- Publisher Organizations (2 members)
- Publishing companies (1 member)
- Puppet states (2 members)
- Quotes (15 members)
- Race (3 members)
- Racism (15 members)
- Racist propaganda (7 members)
- Racists (9 members)
- Rallies (1 member)
- Reactionaries (31 members)
- Reactionary slogans (1 member)
- Reading lists (9 members)
- Rebellions in the United States (1 member)
- Recipients of the Imperial Order of the Iron Crown (3rd Class) (1 member)
- Recipients of the Iron Cross (1939), 1st class (1 member)
- Recipients of the Iron Cross (1939), 2nd class (1 member)
- Recipients of the Knight's Cross of the Iron Cross (2 members)
- Recipients of the Knight's Cross of the Iron Cross with Oak Leaves (1 member)
- Recipients of the Knight's Cross of the Iron Cross with Oak Leaves, Swords, and Diamonds (1 member)
- Recipients of the Knight's Cross of the Iron Cross with Oak Leaves and Swords (1 member)
- Recipients of the Pour le Mérite (military class) (1 member)
- Recipients of the Silver Medal for Bravery (Austria), 1st class (1 member)
- Red Army officers (1 member)
- Red Army soldiers (6 members)
- Red Clarion article (1 member)
- Redirect pages (1 member)
- Redirects connected to a Wikibase item (4 members)
- Regions of the Russian Federation (1 member)