Former Owner
- Leo Olschki3
- Leonard Baskin1
- Leonard Grey, 1st Viscount Grane1
- Leonardo Loredan1
- Leonello d'Este, Marquis of Ferrara2
- Leopold Gruber2
- Librairie Damascène Morgand1
- Libreria antiquaria Mediolanum1
- Libreria la Bibliofila1
- Liechtenstein State Library1
- Lionardo di Paolo Adimari1
- Lionel Tollemache, 4th Earl of Dysart1
- Lisa Unger Baskin1
- Little family1
- Llanthony Priory1
- Loftus Bland1
- London School of Jewish Studies3
- Lorenzo de Olivera1
- Louis H. Silver7
- Louis Herbert Gray1