Former Owner
- Marie de Bretagne d'Avaugour1
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marilyn Carbonell1
- Marino Grimani1
- Mary Lusher1
- Marāṭha, Raṅganātha1
- Matthew Donadski1
- Maximilian Henry of Bavaria1
- Maxwell Sommerville1
- Maḥmūd bin Nāṣir1
- Maḥmūd ibn al-Shaykh al-Fattāḥ1
- Michael M. Zagayski1
- Michiel family1
- Mikhail Golitsyn1
- Mobed Framji Fardunji Madan1
- Mobed Hormazdyar Mobed Khodabaksh1
- Mohammed bin Hamed bu Osman1
- Monasterium sanctorum quadraginta martyrum (Treviso Italy)1
- Monastero di Santo Spirito in Verona1
- Monteles, Avraham de1