Former Owner
- Lajos Graf Apponyi de Nagy-Appony1
- Lambach Abbey2
- Lancino Curti1
- Latham family1
- Lathrop C. Harper, Inc.6
- Laurence Claiborne Witten II6
- Laurence Hilliard1
- Laurence Vaux1
- Laurence William Hodson3
- Laurent Campagne1
- Laurentius van der Torqel1
- Law Society1
- Lawrence J. Schoenberg36
- LeMare1
- Legoué1
- Lehn of Denmark1
- Leicester Harmsworth6
- Leo Olschki1
- Leo S. Olschki Editore10
- Leonardo Bruni1