Former Owner
- M. Louise Stowell1
- Madeleine Cosman1
- Maggs Bros Ltd1
- Mahdī ibn Muṣṭafá al-Ḥusaynī1
- Malachia Ormanian1
- Malvezzi de' Medici1
- Manookjee Sorabjee Ashburner1
- 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
- Maximilian Henry of Bavaria1
- Mazliah Finzi1
- Maḥmūd bin Nāṣir1
- Melk Abbey1
- Michael Bernays1