Former Owner
- Maffeo Pinelli1
- Marco da Bologna1
- Mary Bloch1
- Mathias Schurer1
- Matthew Simpson Parkhurst1
- Matthias Corvinus1
- Menaḥem Naḥum, ha-Leṿi, mi-ḳ.ḳ. Dribin1
- Meschatin La Faye family1
- Michael Kantakouzenos Şeytanoğlu1
- Michael Wodhull1
- Michaeliskonvent1
- Millard Meiss1
- Mirmellus Arnandi1
- Molin1
- Monasterium sanctorum quadraginta martyrum (Treviso Italy)1
- Morton Davis Mitchell1
- Mrs. Turnbull1
- Murray Anthony Potter1
- Museo Cavaleri1
- Nathaniel Castleton Stephen Poyntz1