Former Owner
- King Lawrence Parker1
- Kloster Bredelar1
- Kloster Rebdorf1
- Kāle, Gālambhaṭṭa1
- Kāle, Janārdana1
- Kṛṣṇānanda Āgamavāgīśa Bhaṭṭācārya1
- L. Paganthus1
- Lambach Abbey1
- Lancino Curti1
- Laura Hurd Motion1
- Laurence Harman King-Harman1
- Leigh Baker1
- Leo Olschki1
- Leo S. Olschki Editore1
- Leonardus Martinotius1
- Leonhardus Cuntius1
- Leopold Gruber1
- Leslie, John (c. 1840), bookseller1
- Levi, David, active 19th century1
- Lew David Feldman1