Former Owner
- Leonhardus Cuntius1
- Leopold Gruber1
- Levi, David, active 19th century1
- Lew David Feldman1
- Lewis L. Gould7
- Librairie Tross1
- Libreria la Bibliofila2
- Lionardo di Paolo Adimari1
- Lohanī, Viṣṇudatta1
- London School of Jewish Studies3
- Lorenzo Antonio da Ponte1
- Louis Charles Karpinski1
- Louis César de La Baume Le Blanc1
- Louis H. Silver2
- Louis Herbert Gray1
- Louis Lamm1
- Louis-Jean-Nicolas Monmerqué1
- Lucien Gougy1
- Ludovico Settala1
- Ludwig Rosenthal1