Former Owner
- 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
- Muḥammad ʻAwwād ibn Ḥusayn Afandī1
- Nancy McGrath1
- Nettie Goldsmith Naumburg1
- Neustift Abbey1
- New York Academy of Medicine2
- Nicholas N. Martinovitch1