Former Owner
- Laurent Campagne1
- Laurentius van der Torqel1
- Law Society1
- Lawrence J. Schoenberg87
- LeMare1
- Legoué1
- Lehn of Denmark1
- Leicester Harmsworth7
- Leigh Baker1
- Leo Olschki5
- Leo S. Olschki Editore10
- Leonardo Bruni1
- Leonardo Lapiccirella2
- Leonardo Loredan1
- Leonardus Martinotius1
- Leonello d'Este, Marquis of Ferrara4
- Leonhardus Cuntius1
- Leopold Gruber1
- Lepeletier de Rosanbo1
- Leslie Hindman1