Former Owner
- Leo Olschki1
- Leo S. Olschki Editore1
- Leonard S. Unger1
- Leonardus Martinotius1
- Leonhardus Cuntius1
- Leopold Gruber1
- Levi, David, active 19th century1
- Librairie Tross1
- Lionardo di Paolo Adimari1
- Lohanī, Viṣṇudatta1
- Lorenzo Antonio da Ponte1
- Louis Charles Karpinski1
- Louis César de La Baume Le Blanc1
- Louis Herbert Gray1
- Louis Lamm1
- Louis-Jean-Nicolas Monmerqué1
- Lucien Gougy1
- Ludovic Damas Froissart1
- Ludovico Settala1
- Luis Escobet1