Former Owner
- Julius Heinrich Jeidels1
- Julius Hess1
- Jérôme Bignon1
- Kartause Erfurt1
- Kenneth Hyde1
- Kloster Bredelar1
- Lambach Abbey1
- Lane Theological Seminary1
- Lathrop C. Harper, Inc.1
- Laurence Kirby1
- Laurentius van der Torqel1
- Leonard Grey, 1st Viscount Grane1
- Libreria la Bibliofila1
- Libri, Edoardo, active 20th century1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Loftus Bland1
- Louis Charles Karpinski1
- Louis II, Count of Flanders1
- Lucien Magne1
- Lucrezio Palladio degli Olivi1