Former Owner
- Lambach Abbey1
- Lathrop C. Harper, Inc.1
- Laurence Claiborne Witten II1
- Laurent Campagne1
- Lawrence J. Schoenberg23
- Legoué1
- Leo Olschki1
- Leonard Baskin1
- Leonhardus Cuntius1
- Leopold Gruber1
- Lewis L. Gould2
- Libreria antiquaria Mediolanum1
- Libreria la Bibliofila1
- Lisa Norris Elkins1
- Lisa Unger Baskin1
- Loftus Bland1
- Lorenzo Berdute1
- Lorenzo de Olivera1
- Louis César de La Baume Le Blanc1
- Louis H. Silver2