Former Owner
- Lathrop C. Harper, Inc.1
- Laurence William Hodson1
- Laurentius van der Torqel1
- Leigh Baker1
- Libreria antiquaria Mediolanum1
- Libri, Edoardo, active 20th century1
- Liechtenstein State Library1
- Lionel Tollemache, 4th Earl of Dysart1
- Little family1
- Llanthony Priory1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Loftus Bland1
- Louis II, Count of Flanders1
- Louis Jean Gaignat1
- Louis Lucien Bonaparte1
- Louis N. Cassett1
- Louis XII of France1
- Lucien Delamarre1
- Lucien Magne1
- Luini, Pacifico (Franciscan priest), active 19th century1