Former Owner
- Lambertus Eerens1
- Lancino Curti1
- Latham family1
- Lathrop C. Harper, Inc.7
- Laurence Claiborne Witten II7
- Laurence Harman King-Harman1
- Laurence Hilliard1
- Laurence Vaux1
- Laurence William Hodson4
- Laurent Campagne1
- Laurentius van der Torqel1
- Law Society1
- Lawrence J. Schoenberg87
- LeMare1
- Legoué1
- Lehn of Denmark1
- Leicester Harmsworth7
- Leigh Baker1
- Leo Olschki5
- Leo S. Olschki Editore10