Former Owner
- Marguerite de Fontenay1
- Marguerite of Lorraine1
- Marie Ange-Toussaint Placide de Ferron1
- Marie-Caroline of Bourbon-Two Sicilies, Duchess of Berry1
- Marino Grimani1
- Marion Lawrence1
- Mariota Lyle1
- Martinus Nijhoff1
- Mary Schell Collins1
- Mary, Queen of Scots1
- Matthias Corvinus1
- Maurice Kann1
- Maxwell Sommerville1
- Merlemont family1
- Michael Tomkinson1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Minnis, Katherine1
- Monsieur de Bel Air1
- Morot1
- Morton Davis Mitchell1