Former Owner
- Leo S. Olschki Editore10
- Leonard Grey, 1st Viscount Grane1
- Leonardo Bruni1
- Leonardo Lapiccirella2
- Leonardo Loredan1
- Leonardus Martinotius1
- Leonello d'Este, Marquis of Ferrara4
- Leonhardus Cuntius1
- Lepeletier de Rosanbo1
- Leslie Hindman1
- Leslie, John (c. 1840), bookseller1
- Lew David Feldman1
- Lewis L. Gould25
- Librairie Damascène Morgand1
- Librairie Tross1
- Library of the Dominicans of Paris1
- Libreria la Bibliofila1
- Libri, Edoardo, active 20th century1
- Lima Public Library4
- Linda Ehrsam Voigts4