Former Owner
- McCormick Theological Seminary1
- Melchior Daniel Neubronner1
- Melk Abbey1
- Menaḥem Naḥum, ha-Leṿi, mi-ḳ.ḳ. Dribin1
- Michael Tomkinson1
- Michaeliskonvent1
- Michel Chasles1
- Michele Amari1
- Michiel family1
- Miguel de Mayora1
- Millard Meiss1
- Milt Freudenheim1
- 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