Former Owner
- 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
- Lisa Norris Elkins1
- Little family1
- Llanthony Priory1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn3
- Lodi Cathedral1
- Lodovicus Saltariellus1