Former Owner
- Mary Lacaita1
- Mary Schell Collins1
- Mary Stanley, Countess of Derby1
- Mary Talbot, Countess of Shrewsbury1
- Mary, Queen of Scots1
- Matteo Barresi1
- Matthew Bloxam1
- Matthew Hale1
- Matthias Corvinus1
- Maurice Johnson1
- Maurice Kann1
- Mayer Sulzberger1
- Mayfair Rare Books and Manuscripts1
- Merlemont family1
- Meschatin La Faye family1
- Michael Kantakouzenos Şeytanoğlu1
- Michael Wodhull1
- Michel Chasles1
- Michel Ferdinand d'Albert d'Ailly1
- Michel Guibé1