Former Owner
- Marguerite of Lorraine1
- Marie Thomas1
- Mario Maffei1
- Marion Lawrence1
- Martin Breslauer1
- Mary Stanley, Countess of Derby1
- Mary, Queen of Scots1
- Matthew Bloxam1
- Maurice Johnson1
- Meschatin La Faye family1
- Michel Chasles1
- Moritz Dessauer1
- Morot1
- Mrs. E.J. Hooper1
- Museo Cavaleri1
- Nanna Corbinello1
- Nicholai von Bodeck1
- Nonnberg Abbey1
- Otto Ege1
- P. Pigeot1