Former Owner
- Leonello d'Este, Marquis of Ferrara2
- Lew David Feldman1
- Librairie Damascène Morgand1
- Llewelyn Lloyd-Mostyn, 3rd Baron Mostyn of Mostyn1
- Louis César de La Baume Le Blanc1
- Louis H. Silver8
- Luigi Celotti1
- Luis Mayora1
- Madeleine Cosman1
- Marco Antonio Morosini1
- Margaret of Croy1
- Marguerite de Belleville1
- Marie Thomas1
- Marienstiftsgymnasium1
- Martin J. Cooper3
- Matteo Luigi Canonici1
- Miguel de Mayora1
- Milt Freudenheim1
- Milton Fischmann23
- Miriam Lutcher Stark4