Former Owner
- Lehn of Denmark1
- Leicester Harmsworth1
- Lew David Feldman1
- Libri, Edoardo, active 20th century1
- Lima Public Library1
- Lodi Cathedral1
- Lodovicus Saltariellus1
- Louis Bourguet1
- Louis Charles Elson1
- Louis XII of France1
- Lucien Magne1
- Lucrezio Palladio degli Olivi1
- Luigi Arrigoni1
- Luigi Clerici1
- Luigi Serra di Cassano1
- Luini, Pacifico (Franciscan priest), active 19th century1
- Magby, H1
- Mannheimer Hofbibliothek1
- Marcantonio Contarini1
- Marcantonio V Borghese1