Former Owner
- Librairie Tross1
- Libreria la Bibliofila1
- Louis Charles Karpinski1
- Louis H. Silver1
- Louis-Jean-Nicolas Monmerqué1
- Lucien Gougy1
- Ludovico Settala1
- Ludwig Rosenthal1
- Luigi Celotti1
- Lundell Library1
- Maggs Bros Ltd1
- Malvezzi de' Medici1
- Manuel Fernández del Castillo1
- Margaret Barclay Wilson1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marienstiftsgymnasium1
- Mary Augusta Strachey1
- Mary Lusher1
- Matthew Donadski1