Former Owner
- Meschatin La Faye family1
- Michael Kantakouzenos Şeytanoğlu1
- Michael Wodhull1
- Michaeliskonvent1
- Michel Chasles1
- Michel Ferdinand d'Albert d'Ailly1
- Michel de Léon1
- Michele Amari1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Mikhail Golitsyn1
- Millard Meiss1
- Minerva Kaiser1
- Minnis, Katherine1
- Mistrie, Sita Ram, Pandit1
- Mitchell Starrett Buck1
- Molin1
- Monasterio de El Paular1
- Monastery of Benevívere1
- Monastery of Saint Peter (Erfurt, Germany)1
- Monica Franklyn1