Former Owner
- Luigi Serra di Cassano1
- Lydia Thompson Morris1
- M. Louise Stowell1
- Mahdī ibn Muṣṭafá al-Ḥusaynī1
- Manookjee Sorabjee Ashburner1
- Manuel Fernández del Castillo1
- Manuel John Johnson1
- Marc-René de Voyer d'Argenson1
- Marie Thomas1
- Mary Stanley, Countess of Derby1
- Mary Talbot, Countess of Shrewsbury1
- Mary, Queen of Scots1
- Matthew Bloxam1
- Maurice Johnson1
- Maḥmūd ibn al-Shaykh al-Fattāḥ1
- Melk Abbey1
- Michael Tomkinson1
- Mitchell Starrett Buck1
- Mobed Framji Fardunji Madan1
- Mobed Hormazdyar Mobed Khodabaksh1