Former Owner
- Laurence Claiborne Witten II2
- Laurentius van der Torqel1
- Lawrence J. Schoenberg7
- Leo S. Olschki Editore8
- Leonardo Lapiccirella2
- Leonello d'Este, Marquis of Ferrara3
- Libreria antiquaria Hoepli12
- Long Island Historical Society, Maine1
- Louis César de La Baume Le Blanc2
- Louis XIV of France1
- Lucien Graux1
- Lucien Magne1
- Luigi Celotti1
- Luigi Serra di Cassano1
- Lyon Cathedral1
- Léon Techener1
- Mademoiselle de Malberghe1
- Maffeo Pinelli1
- Maggs Bros Ltd20
- Manuel John Johnson1