Former Owner
- Library of the Dominicans of Paris1
- Libreria antiquaria Mediolanum1
- Libri, Edoardo, active 20th century1
- Liechtenstein State Library1
- Lionardo di Paolo Adimari1
- Lisa Norris Elkins1
- Lisa Unger Baskin1
- Little family1
- Llanthony Priory1
- Lodi Cathedral1
- Lodovicus Saltariellus1
- Loftus Bland1
- Lohanī, Viṣṇudatta1
- Long Island Historical Society, Maine1
- Lorenzo Antonio da Ponte1
- Lorenzo Berdute1
- Lorenzo de Olivera1
- Louis Bourguet1
- Louis Charles Karpinski1
- Louis Herbert Gray1