Former Owner
- Marcela Gabriela1
- Marco da Bologna1
- Margaret F. Woodward1
- Marguerite de Fontenay1
- Marie Ange-Toussaint Placide de Ferron1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Mariota Lyle1
- Martinus Nijhoff1
- Mary Bloch1
- Mathias Schurer1
- Matteo Barresi1
- Matthew Simpson Parkhurst1
- Matthias Corvinus1
- Maurice Kann1
- Mayer Sulzberger1
- Mayfair Rare Books and Manuscripts1
- Melk Abbey1
- Meschatin La Faye family1
- Michael Kantakouzenos Şeytanoğlu1