Former Owner
- Lathrop Colgate Harper1
- Laurence Claiborne Witten II1
- Laurence Kirby1
- Laurence William Hodson1
- Laurentius van der Torqel1
- Law Society1
- Leo Olschki1
- Leonard Grey, 1st Viscount Grane1
- Librairie Damascène Morgand1
- Libreria antiquaria Mediolanum1
- Lionel Tollemache, 4th Earl of Dysart1
- Little family1
- Llanthony Priory1
- Loftus Bland1
- Louis XII of France1
- Ludwig Rosenthal's Antiquariaat1
- Luigi Clerici1
- Luigi Cora1
- Luigi Serra di Cassano1
- Luis Mayora1