Former Owner
- Mary Bloch1
- Mathias Schurer1
- Matteo Luigi Canonici1
- Matthew Simpson Parkhurst1
- Matthias Corvinus1
- Maurilio Morazio1
- Merlemont family1
- Meschatin La Faye family1
- Michael Kantakouzenos Şeytanoğlu1
- Michael Wodhull1
- Michaeliskonvent1
- Mikhail Golitsyn1
- Millard Meiss1
- Mirmellus Arnandi1
- Molin1
- Morton Davis Mitchell1
- Mrs. Turnbull1
- Murray Anthony Potter1
- Museo Cavaleri1
- Muḥammad ʻAlī Ḥasanī Dāʻī al-Islāmī1