Former Owner
- Legoué1
- Lehn of Denmark1
- Leicester Harmsworth7
- Leo Olschki9
- Leo S. Olschki Editore9
- Leonard Grey, 1st Viscount Grane1
- Leonardo Lapiccirella2
- Leonello d'Este, Marquis of Ferrara4
- Lepeletier de Rosanbo1
- Leslie Hindman1
- Lew David Feldman1
- Lewis L. Gould18
- Librairie Damascène Morgand2
- Library of the Dominicans of Paris1
- Libreria antiquaria Mediolanum1
- Libri, Edoardo, active 20th century1
- Lima Public Library4
- Linda Ehrsam Voigts5
- Lionel Tollemache, 4th Earl of Dysart2
- Lisa Kiser12