Former Owner
- Lawrence J. Schoenberg37
- LeMare1
- Legoué1
- Lehn of Denmark1
- Leicester Harmsworth7
- Leo Olschki7
- Leo S. Olschki Editore10
- Leonard Grey, 1st Viscount Grane1
- Leonardo Bruni1
- Leonardo Lapiccirella2
- Leonardo Loredan1
- Leonardus Martinotius1
- Leonello d'Este, Marquis of Ferrara4
- Leonhardus Cuntius1
- Lepeletier de Rosanbo1
- Leslie Hindman1
- Leslie, John (c. 1840), bookseller1
- Lew David Feldman1
- Lewis L. Gould25
- Librairie Damascène Morgand1