Former Owner
- Manookjee Sorabjee Ashburner1
- Manuel Fernández del Castillo2
- Manuel John Johnson1
- Marc-René de Voyer d'Argenson1
- Marcianus F. Rossi1
- Marie de Bretagne d'Avaugour1
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marilyn Carbonell1
- Marino Grimani1
- Mario Pedro Arata1
- Marquis of Astorga1
- Mary Lusher1
- Marāṭha, Raṅganātha1
- Matteo Luigi Canonici3
- Matthaeus Lupin1
- Matthew Donadski1
- Maximilian Henry of Bavaria1
- Maxwell Sommerville1
- Mayer Sulzberger2
- Maḥmūd bin Nāṣir1