Former Owner
- Marie de Bretagne d'Avaugour1
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marienstiftsgymnasium1
- Marino Grimani1
- Mario Maffei1
- Marion H. Gottfried1
- Marion Lawrence1
- Mark Lansburgh1
- Martin of Aragon1
- Marvin-L. Colker1
- Mary Augusta Strachey1
- Mary Bloch1
- Mary Elizabeth Holte1
- Mary Lusher1
- Mary Schell Collins1
- Mary, Queen of Scots1
- Matteo Barresi1
- Matthew Bloxam1
- Matthew Donadski1
- Matthew Simpson Parkhurst1