Former Owner
- Mikhail Golitsyn2
- Millard Meiss1
- Milt Freudenheim1
- Milton Fischmann27
- Milton S. Carothers1
- Minerva Kaiser1
- Minnis, Katherine1
- Miriam Lutcher Stark6
- Mirmellus Arnandi1
- Miss Gostling1
- Mistrie, Sita Ram, Pandit1
- Mitchell Starrett Buck1
- Mobed Framji Fardunji Madan1
- Mobed Hormazdyar Mobed Khodabaksh1
- Mohamed. Makiya2
- Mohammed bin Hamed bu Osman1
- Moissac Abbey1
- Molin1
- Monasterio de El Paular1
- Monasterium sanctorum quadraginta martyrum (Treviso Italy)1