Former Owner
- Leonard Grey, 1st Viscount Grane1
- Leonardo Bruni1
- Leonardo Lapiccirella1
- Leonardo Loredan1
- Leopold Gruber1
- Leslie Hindman1
- Lew David Feldman1
- Libreria la Bibliofila1
- Libri, Edoardo, active 20th century1
- Liechtenstein State Library1
- Lionardo di Paolo Adimari1
- Lionel Tollemache, 4th Earl of Dysart1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Lodovicus Saltariellus1
- Long Island Historical Society, Maine1
- Lorenzo Antonio da Ponte1
- Louis Bourguet1
- Louis Jean Gaignat1
- Louis Thompson Rowe1
- Louis XII of France1