Former Owner
- Justin MacCarthy Reagh1
- Jérôme Pichon1
- Kang Youwei1
- Katherine Somerset Wyttenbach Fenwick1
- Konrad von Maurer1
- L. Paganthus1
- Lambach Abbey1
- Lathrop C. Harper, Inc.1
- Laurent Campagne1
- Legoué1
- Leo Olschki1
- Leonard Baskin1
- Leonhardus Cuntius1
- Libreria antiquaria Mediolanum1
- Libreria la Bibliofila1
- Lisa Norris Elkins1
- Lisa Unger Baskin1
- Louis Charles Elson1
- Louis César de La Baume Le Blanc1
- Louis H. Silver1