Former Owner
- Lathrop Colgate Harper1
- Laurence William Hodson1
- Lawrence J. Schoenberg68
- Leicester Harmsworth2
- Leo Olschki3
- Leopold Gruber1
- Levi, David, active 19th century1
- Lindwer, Willy2
- Lionardo di Paolo Adimari1
- Lionel Tollemache, 4th Earl of Dysart1
- London School of Jewish Studies3
- Louis César de La Baume Le Blanc1
- Louis Herbert Gray1
- Louis N. Cassett1
- Louis-Jean-Nicolas Monmerqué1
- Lucien Gougy2
- Ludovic Damas Froissart1
- Ludovico Settala1
- Luigi Celotti1
- Luini, Pacifico (Franciscan priest), active 19th century1