Former Owner
- Marcela Gabriela1
- Marco da Bologna1
- Margaret F. Woodward1
- Margaret Le Seigneur1
- Marguerite de Fontenay1
- Marguerite of Lorraine1
- Maria Riddell1
- Marie Ange-Toussaint Placide de Ferron1
- Marion Lawrence1
- Mariota Lyle1
- Martinus Nijhoff1
- Mary Schell Collins1
- Mary, Queen of Scots1
- Matthias Corvinus1
- Maurice Kann1
- Mayer Sulzberger1
- Menno Hertzberger1
- Merlemont family1
- Michael Tomkinson1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1