Former Owner
- Maria Riddell1
- 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 W. T. Dickinson2
- Mary, Queen of Scots1
- Matteo Luigi Canonici3
- Matthias Corvinus1
- Maurice Kann1
- Maxwell Sommerville1
- Mayer Sulzberger1
- Menno Hertzberger1
- Merlemont family1
- Messieurs Du Trieu2
- Michael Tomkinson1
- Michel Chasles2