Former Owner
- Leonardus Martinotius1
- Leonello d'Este, Marquis of Ferrara4
- Leonhardus Cuntius1
- Leopold Gruber1
- Lepeletier de Rosanbo1
- Levi, David, active 19th century1
- Lewis L. Gould25
- Librairie Damascène Morgand2
- Librairie Tross1
- Library of the Dominicans of Paris1
- Libreria antiquaria Mediolanum1
- Libreria la Bibliofila2
- Libri, Edoardo, active 20th century1
- Linda Ehrsam Voigts5
- Lionardo di Paolo Adimari1
- Lionel Tollemache, 4th Earl of Dysart2
- Lisa Norris Elkins1
- Lisa Unger Baskin1
- Little family1
- Llanthony Priory1