Former Owner
- Maurilio Morazio1
- Maximilian Henry of Bavaria1
- Mayer Sulzberger1
- Melchior Daniel Neubronner1
- Merlemont family1
- Michael Bernays1
- Michael M. Zagayski1
- Michiel family1
- Milton Fischmann4
- Miriam Lutcher Stark3
- Moritz Joseph Johann von Dietrichstein1
- Morris Jastrow, Jr.1
- Mortimer Frank1
- Mortimer Loeb Schiff1
- Mr. Hals1
- Muhsinzâde Ömer Aǧa1
- Musa Kâzım Efendi1
- Museo Cavaleri1
- Muḥammad Amīn al-Sabtī al-Alūsī Anṣārī1
- Muḥammad Anīs Ṭālawī1