Former Owner
- Marie de Albano1
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marino Grimani1
- Mario Maffei1
- Marion Lawrence1
- Mariota Lyle1
- Mark Lansburgh1
- Martin Breslauer1
- Martinus Nijhoff1
- Mary Elizabeth Holte1
- Mary Lusher1
- Mary Stanley, Countess of Derby1
- Mary, Queen of Scots1
- Matteo Barresi1
- Matthew Bloxam1
- Matthias Corvinus1
- Maurice Johnson1
- Maurice Kann1
- Maxwell Sommerville1
- Michael Greenberg1