Former Owner
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marino Grimani1
- Martin Breslauer1
- Mathias Schurer1
- Matthias Corvinus1
- Maurice Kann1
- Mercantile Library Company1
- Michael Wodhull1
- Mikhail Golitsyn1
- Millard Meiss1
- Molin1
- Monasterium sanctorum quadraginta martyrum (Treviso Italy)1
- Murray Anthony Potter1
- Nathaniel Sherman Bouton1
- Niccolò Albergati1
- Nicholas B. Scheetz1
- Nicolai Briganti1
- Nicolaus de Monte Murro1
- Norman H. Strouse1
- Orlandus de Fatiis1