Former Owner
- Legoué1
- Leonard Grey, 1st Viscount Grane1
- Leonardus Martinotius1
- Leopold Gruber1
- Lepeletier de Rosanbo1
- Librairie Tross1
- Library of the Dominicans of Paris1
- Libreria antiquaria Mediolanum1
- Libri, Edoardo, active 20th century1
- Lionardo di Paolo Adimari1
- Lisa Norris Elkins1
- Llanthony Priory1
- Lodi Cathedral1
- Lodovicus Saltariellus1
- Lohanī, Viṣṇudatta1
- Long Island Historical Society, Maine1
- Lorenzo Antonio da Ponte1
- Louis Bourguet1
- Louis Herbert Gray1
- Louis II, Count of Flanders1