Former Owner
- Miguel de Mayora1
- Millard Meiss1
- Milt Freudenheim1
- Milton Fischmann24
- Mobed Framji Fardunji Madan1
- Mobed Hormazdyar Mobed Khodabaksh1
- Mohammed bin Hamed bu Osman1
- Moissac Abbey1
- Monasterio de El Paular1
- Monastery at San Gregorio al Celio1
- Moritz Dessauer1
- Moritz Joseph Johann von Dietrichstein1
- Morris H. Morgan1
- Morris Harold Saffron1
- Morris Jastrow, Jr.15
- Mortimer Frank1
- Morton Parker Eden1
- Muriel Agnes Fry1
- Murray Anthony Potter1
- Mushtaq Ali Khan I of Rampur1