Former Owner
- Latham family1
- Lathrop C. Harper, Inc.1
- Laurence Claiborne Witten II1
- Laurentius van der Torqel1
- Leonardo Lapiccirella1
- Libreria la Bibliofila1
- Libri, Edoardo, active 20th century1
- Liechtenstein State Library1
- Little family1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Louis Jean Gaignat1
- Louis XII of France1
- Lucien Magne1
- Maffeo Pinelli1
- Marcela Gabriela1
- Margaret F. Woodward1
- Marguerite de Fontenay1
- Marie Ange-Toussaint Placide de Ferron1
- Marie Cleophe de Sollario1
- Marie de Albano1