Former Owner
- Madeleine Cosman1
- Mahdī ibn Muṣṭafá al-Ḥusaynī1
- Malachia Ormanian1
- Malvezzi de' Medici1
- Manookjee Sorabjee Ashburner1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Mario Maffei1
- Markus Fugger1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Matteo Luigi Canonici3
- Maximilian Henry of Bavaria1
- Mayer Sulzberger2
- Mazliah Finzi1
- Maḥmūd bin Nāṣir1
- Michel Chasles1
- Michel de Léon1
- Mobed Framji Fardunji Madan1
- Mobed Hormazdyar Mobed Khodabaksh1
- Mohammed bin Hamed bu Osman1