Former Owner
- M. Favia del Core1
- M. Haimmiller1
- Madeleine Cosman1
- Magby, H1
- Mahdī ibn Muṣṭafá al-Ḥusaynī1
- Malachia Ormanian1
- Manoel S. Pinto1
- Manūchihr Nukhastīn Āṣaf Qājār1
- Marc-René de Voyer d'Argenson1
- Margaret Barclay Wilson1
- Margaret of Croy1
- Maria Ludovica Favia del Core Borromeo1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marienstiftsgymnasium1
- Mark Augspürger1
- Markus Fugger1
- Mary Augusta Strachey1
- Mary Schell Collins1
- Matteo Barresi1