Former Owner
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Mikhail Golitsyn1
- Millard Meiss1
- Minerva Kaiser1
- Minnis, Katherine1
- Mistrie, Sita Ram, Pandit1
- Mitchell Starrett Buck1
- Mohamed. Makiya1
- Molin1
- Monasterio de El Paular1
- Monastery of Benevívere1
- Monastery of Saint Peter (Erfurt, Germany)1
- Monica Franklyn1
- Monsieur de Bel Air1
- Moritz Dessauer1
- Moritz Joseph Johann von Dietrichstein1
- Morot1
- Mortimer Loeb Schiff1
- Morton Davis Mitchell1
- Morton Parker Eden1