Former Owner
- Lane Theological Seminary1
- Latham family1
- Lathrop C. Harper, Inc.6
- Lathrop Colgate Harper15
- Laurence Claiborne Witten II6
- Laurence Hilliard1
- Laurence Kirby1
- Laurence Vaux1
- Laurence William Hodson7
- Laurent Campagne1
- Laurentius van der Torqel1
- Law Society1
- Lawrence J. Schoenberg38
- LeMare1
- Legoué1
- Lehn of Denmark1
- Leicester Harmsworth7
- Leo Olschki9
- Leo S. Olschki Editore9
- Leonard Grey, 1st Viscount Grane1