Former Owner
- Marcantonio V Borghese1
- Marchese Porri-Carcani1
- Margaret F. Woodward1
- Margaret Le Seigneur1
- Margaret of Croy1
- Margareta van der Dycke1
- Margaretha van Cleyburg1
- Marguerite de Belleville1
- Marguerite de Fontenay1
- Marguerite of Lorraine1
- Marie Ange-Toussaint Placide de Ferron1
- Marilyn Carbonell1
- Marion H. Gottfried1
- Marion Lawrence1
- Martinus Nijhoff1
- Mary Elizabeth Holte1
- Mary Schell Collins1
- Mary, Queen of Scots1
- Merlemont family1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1