The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Langston Hughes (1 member)
- Language (6 members)
- Laotian leaders (3 members)
- Latin American countries (15 members)
- Law enforcement (2 members)
- Leaders (9 members)
- Leaders by country (1 member)
- Leaders of political parties (1 member)
- Left-wing ideologies (28 members)
- Left communism (4 members)
- Left communists (2 members)
- Leftist music (5 members)
- Lemmygrad Community (1 member)
- Leninism (9 members)
- Letters between Marx and Engels (1 member)
- Liberalism (2 members)
- Liberals (8 members)
- Libertarianism (4 members)
- Library (31 members)
- Library documents from Albania (2 members)