Former Owner
- Maurice Johnson1
- Maḥmūd ibn al-Shaykh al-Fattāḥ1
- Melchior Daniel Neubronner1
- Melk Abbey1
- Michael Tomkinson1
- Miguel de Mayora1
- Miha'el Hayyim ben Yosef bar Ya'akov1
- Milt Freudenheim1
- Milton Fischmann27
- Mitchell Starrett Buck1
- 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
- Morris Harold Saffron1
- Mortimer Loeb Schiff1
- Morton Parker Eden1
- Muhammed Ali Khan Wallajah1