Former Owner
- Michael M. Zagayski1
- Michael Wodhull1
- Michaeliskonvent1
- Michiel family1
- Mikhail Golitsyn2
- Millard Meiss1
- Mirmellus Arnandi1
- Molin1
- Monasterium sanctorum quadraginta martyrum (Treviso Italy)1
- Morris H. Morgan5
- Morton Davis Mitchell1
- Mrs. Turnbull1
- Muhsinzâde Ömer Aǧa1
- Murray Anthony Potter1
- Musa Kâzım Efendi1
- Museo Cavaleri1
- Muḥammad Amīn al-Sabtī al-Alūsī Anṣārī1
- Muḥammad Anīs Ṭālawī2
- Muḥammad ʻAlī Ḥasanī Dāʻī al-Islāmī1
- Nathaniel Castleton Stephen Poyntz1