Former Owner
- Legoué1
- Lehn of Denmark1
- Leicester Harmsworth7
- Leigh Baker1
- Leo Olschki11
- Leo S. Olschki Editore10
- Leonard Baskin1
- Leonard Grey, 1st Viscount Grane1
- Leonardo Bruni1
- Leonardo Lapiccirella2
- Leonardo Loredan1
- Leonardus Martinotius1
- Leonello d'Este, Marquis of Ferrara4
- Leonhardus Cuntius1
- Leopold Gruber2
- Lepeletier de Rosanbo1
- Leslie Hindman1
- Levi, David, active 19th century1
- Lew David Feldman2
- Lewis L. Gould25