Former Owner
- Katherine Somerset Wyttenbach Fenwick4
- Keith Jarvis1
- Kenneth J. "Bud" Jennings2
- Lancino Curti1
- Lathrop C. Harper, Inc.5
- Laurence Claiborne Witten II2
- Laurence William Hodson1
- Lawrence J. Schoenberg5
- Lehn of Denmark1
- Leicester Harmsworth1
- Leo Olschki2
- Leo S. Olschki Editore7
- Leonardo Loredan1
- Leonardus Martinotius1
- Leonello d'Este, Marquis of Ferrara1
- Lew David Feldman1
- Lewis L. Gould9
- Libreria antiquaria Hoepli8
- Lima Public Library1
- Linda Ehrsam Voigts2