Former Owner
- Marguerite de Fontenay1
- Marie Ange-Toussaint Placide de Ferron1
- Marie Cleophe de Sollario1
- Marie Thomas1
- Marie de Albano1
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marino Grimani1
- Mark Lansburgh1
- Matteo Luigi Canonici1
- Maurice Kann1
- Mayfair Rare Books and Manuscripts1
- Melk Abbey1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Miguel de Mayora1
- Milt Freudenheim1
- Minerva Kaiser1
- Minnis, Katherine1
- Moissac Abbey1
- Monasterio de El Paular1
- Monastery of Our Lady of the Angels of Churubusco1