The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Lipton’s (34 members)
- List formatting and function templates (5 members)
- Listening (27 members)
- Lit Study Guides (15 members)
- Literary (160 members)
- Literature (2 members)
- Literature (FAQ) (20 members)
- Lomography 400 (15 members)
- London 2009 (372 members)
- London 2011 (10 members)
- Lord Byron (4 members)
- Loxia 2/35 (9 members)
- Lua-based templates (10 members)
- Lua String-based templates (1 member)
- Lucas Family (34 members)
- Lucille Clifton (1 member)
- Ludwig van Beethoven (1 member)
- Lyle Lovett (2 members)
- MGA (64 members)
- MGL (25 members)
- MSC (1 member)
- Madeline Miller (1 member)
- Mailer’s Short Fiction (32 members)
- Maps (5 members)
- Margaret Atwood (2 members)
- Mark Strand (1 member)
- Marriage (1 member)
- Martin Luther King, Jr. (1 member)
- Mary Elizabeth Coleridge (1 member)
- Mary Shelley (0 members)
- Maternity (1 member)
- Matthew Arnold (1 member)
- Maya Angelou (1 member)
- Mbox and messagebox templates (3 members)
- Mechanics (FAQ) (8 members)
- Media (1 member)
- Media Study Guides (11 members)
- Memento Mori (16 members)
- Mesopotamian (3 members)
- Meta (126 members)
- Michael Cunningham (1 member)
- Michael Moorcock (1 member)
- Microformat (uF) message templates (1 member)
- Middle School (2 members)
- Midjourney (56 members)
- Mikhail Bulgakov (2 members)
- Mikhail Lermontov (1 member)
- Minimalism (9 members)
- Miscellaneous (1 member)
- Modernist (1 member)