Former Owner
- John West, 1st Earl De La Warr1
- John Wright2
- Joost Ritman1
- Katholieke Universiteit te Leuven Universiteitsbibliotheek1
- Klaus Dieter Dahmen1
- Lambertus Eerens1
- Laurent Campagne1
- LeMare1
- Legoué1
- Leonardus Martinotius1
- Lepeletier de Rosanbo1
- Leslie, John (c. 1840), bookseller1
- Library of the Dominicans of Paris1
- Louis Bourguet1
- Louis César de La Baume Le Blanc1
- Lucien Graux1
- Luigi Cora1
- Lutheran Theological Seminary at Philadelphia1
- Lydia Thompson Morris1
- Mademoiselle de Malberghe1