Former Owner
- 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
- Library of the Dominicans of Paris1
- Libreria antiquaria Mediolanum1
- Libri, Edoardo, active 20th century1
- Liechtenstein State Library1
- Lionardo di Paolo Adimari1
- Lisa Norris Elkins1
- Lisa Unger Baskin1