Former Owner
- Laurence Vaux1
- Laurent Campagne1
- Laurentius van der Torqel1
- Law Society1
- LeMare1
- Legoué1
- Lehn of Denmark1
- Leigh Baker1
- Leonard Baskin1
- Leonard Grey, 1st Viscount Grane1
- Leonard S. Unger1
- Leonardo Bruni1
- Leonardo Loredan1
- Leonardus Martinotius1
- Leonhardus Cuntius1
- Lepeletier de Rosanbo1
- Leslie Hindman1
- Leslie, John (c. 1840), bookseller1
- Levi, David, active 19th century1
- Librairie Tross1