Former Owner
- Malvezzi de' Medici1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Manṣūr, Abū al-Faz̤l ibn Ghiyāth al-Dīn1
- Maria Riddell1
- Mario Maffei1
- Markus Fugger1
- Marvin-L. Colker1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Mazliah Finzi1
- Melk Abbey1
- Michael Bernays1
- Michael Krupp1
- Michel Chasles1
- Michel de Léon1
- Mitchell Starrett Buck1
- Mohamed. Makiya1
- Moritz Dessauer1
- Moritz Joseph Johann von Dietrichstein1
- Mortimer Frank1