Former Owner
- 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
- Mohammed bin Hamed bu Osman1
- Monasterio de El Paular1
- Morris Harold Saffron1
- Mortimer Loeb Schiff1
- Morton Parker Eden1
- Muhammed Ali Khan Wallajah1
- Mullā ʻAbbās Zīvarī1
- Mushtaq Ali Khan I of Rampur1
- Muḥammad Amīn ʻAṭṭār1
- Muḥammad Bāqir1