Former Owner
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marino Grimani1
- Marion Lawrence1
- Mariota Lyle1
- Martinus Nijhoff1
- Mary W. T. Dickinson1
- Mary, Queen of Scots1
- Matteo Luigi Canonici1
- Matthias Corvinus1
- Maurice Kann1
- Maxwell Sommerville1
- Michel Chasles1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Minnis, Katherine1
- Monsieur de Bel Air1
- Morot1
- Muriel Agnes Fry1
- Muḥammad Ṣadr al-Dīn1
- Nicolas Rauch1
- Nicolas Yemeniz1