Former Owner
- John Frederick Lewis2
- Joost Ritman1
- Juan Rodriguez1
- Juan de Iriarte y Cisneros1
- Judith Lady Montefiore College1
- Julius Bisno1
- Lawrence J. Schoenberg2
- Libreria antiquaria Mediolanum1
- Lisa Kiser1
- London School of Jewish Studies1
- Maggs Bros Ltd3
- Mario Pedro Arata1
- Marquis of Astorga1
- Martin J. Cooper4
- Martin Picker1
- Martin of Aragon1
- Michele Amari1
- Milton Fischmann4
- Miriam Lutcher Stark2
- Monastery of Benevívere1