Former Owner
- Legoué1
- Lehn of Denmark1
- Leonard Grey, 1st Viscount Grane1
- Lepeletier de Rosanbo1
- Leslie Hindman1
- Lew David Feldman1
- Library of the Dominicans of Paris1
- Libreria antiquaria Mediolanum1
- Libri, Edoardo, active 20th century1
- Lisa Norris Elkins1
- Llanthony Priory1
- Lodi Cathedral1
- Lodovicus Saltariellus1
- Loftus Bland1
- Long Island Historical Society, Maine1
- Louis Bourguet1
- Louis II, Count of Flanders1
- Louis Jean Gaignat1
- Louis Loewe1
- Louis Lucien Bonaparte1