Former Owner
- Mario Maffei1
- Mario Pedro Arata1
- Marion H. Gottfried1
- Marion Lawrence1
- Mariota Lyle1
- Mark Augspürger1
- Mark Lansburgh2
- Mark Sittich von Hohenems Altemps1
- Markus Fugger1
- Marquis of Astorga1
- Marsden J. Perry1
- Martin Breslauer1
- Martin J. Cooper4
- Martin Picker3
- Martin Schøyen8
- Martin of Aragon1
- Martinus Nijhoff1
- Marvin-L. Colker4
- Mary Augusta Strachey1
- Mary Bloch1