Former Owner
- Mark Lansburgh1
- Martin of Aragon1
- Mary Elizabeth Holte1
- Mary Lacaita1
- Mary Lusher1
- Mary Schell Collins1
- Mary, Queen of Scots1
- Matteo Barresi1
- Matthew Bloxam1
- Matthias Corvinus1
- Maurice Johnson1
- Maurice Kann1
- Mayfair Rare Books and Manuscripts1
- Merlemont family1
- Meschatin La Faye family1
- Michael Wodhull1
- Michel Chasles1
- Michel Ferdinand d'Albert d'Ailly1
- Michel Guibé1
- Michel de Léon1