The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Trinidad and Tobago (1 member)
- Tunisia (2 members)
- Turkey (3 members)
- Types of socialism (2 members)
- UK (15 members)
- USA (60 members)
- USSR (8 members)
- US Imperialism (4 members)
- Uganda (1 member)
- Ukraine (8 members)
- United Kingdom (5 members)
- Universities (2 members)
- Uprisings (33 members)
- Uruguay (1 member)
- Venezuela (2 members)
- Victims of Assassination (2 members)
- Victims of Assassinations (1 member)
- Video Games (4 members)
- Vietnam (4 members)
- Vietnam War (1 member)
- War (1 member)
- War on Drugs (1 member)
- Wars (10 members)
- Water Uprisings (3 members)
- Websites (4 members)
- Welfare Resistance (1 member)
- Western Africa (7 members)
- Western Asia (22 members)
- Western Europe (30 members)
- White Terrors (2 members)
- Wikipedia Import (1 member)
- William Blum (2 members)
- With long short description (8 members)
- With short description (7 members)
- Work-Ins (12 members)
- Worker Cooperatives (7 members)
- Worker Uprisings (9 members)
- Workers' Self-Management (33 members)
- Workplace Organising (1 member)
- World War I (1 member)
- World War II (7 members)
- Yemen (2 members)
- YouTubers (2 members)
- Yugoslavia (1 member)
- Zambia (4 members)
- Zapatismo (2 members)
- Zapatistas (3 members)
- Zimbabwe (1 member)
- Zionism (2 members)
- Zombies (1 member)