The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Book review websites (1 member)
- Books (14 members)
- Books not in our library (5 members)
- Books with missing cover (1 member)
- Bourgeois governments (1 member)
- Bourgeois media (16 members)
- Bourgeois revolutionaries (4 members)
- Bourgeois social media (1 member)
- Box-header with insufficient title contrast (4 members)
- Brazilian citizens (1 member)
- Brazilian communists (2 members)
- Brazilian journalists (1 member)
- BreadTube (5 members)
- Breadtube (0 members)
- British Prime Ministers (14 members)
- British anti-imperialists (1 member)
- British communist parties (7 members)
- British communists (4 members)
- British people of German descent (1 member)
- British political economists (3 members)