Former Owner
- Milt Freudenheim1
- Milton Fischmann25
- Milton S. Carothers1
- Minerva Kaiser1
- Minnis, Katherine1
- Miriam Lutcher Stark5
- Moissac Abbey1
- Molin1
- Monasterio de El Paular1
- Monastery of Benevívere1
- Monastery of Our Lady of the Angels of Churubusco1
- Monastery of Saint Peter (Erfurt, Germany)1
- Monastery of San Bartolmeo, Arezzo, Tuscany1
- Monica Franklyn1
- Monsieur de Bel Air1
- Monē tou Timiou Prodromou1
- Moor of Ireton1
- Moritz Dessauer1
- Morot1
- Morris H. Morgan3