Former Owner
- Leonardo Lapiccirella1
- Leonardo Loredan1
- Leonello d'Este, Marquis of Ferrara4
- Leopold Gruber1
- Leslie Hindman1
- Leslie, John (c. 1840), bookseller1
- Lew David Feldman1
- Lewis L. Gould17
- Librairie Damascène Morgand2
- Libreria la Bibliofila1
- Libri, Edoardo, active 20th century1
- Liechtenstein State Library1
- Lima Public Library3
- Linda Ehrsam Voigts3
- Lionardo di Paolo Adimari1
- Lionel Tollemache, 4th Earl of Dysart1
- Lisa Kiser6
- Little family1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Lodovicus Saltariellus1