Former Owner
- Laurent Campagne1
- Laurentius van der Torqel1
- Law Society1
- LeMare1
- Legoué1
- Lehn of Denmark1
- Leonard Grey, 1st Viscount Grane1
- Lepeletier de Rosanbo1
- Leslie Hindman1
- Lew David Feldman1
- Librairie Damascène Morgand1
- Library of the Dominicans of Paris1
- Libri, Edoardo, active 20th century1
- Lisa Norris Elkins1
- Little family1
- Llanthony Priory1
- Lodi Cathedral1
- Lodovicus Saltariellus1
- Loftus Bland1
- Long Island Historical Society, Maine1