Former Owner
- Maurice Kann1
- Maxwell Sommerville1
- Menno Hertzberger1
- Merlemont family1
- Messieurs Du Trieu2
- Michael Tomkinson1
- Michel Chasles1
- Michele Cavaleri2
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Minnis, Katherine1
- Mitchell Starrett Buck1
- Monsieur de Bel Air1
- Morot1
- Morris Harold Saffron1
- Morton Davis Mitchell1
- Mrs. F. W. Bartlett1
- Muriel Agnes Fry1
- Museo Cavaleri1
- Muḥammad Darvīsh Nūr al-Dīn Sunbulī1
- Muḥammad Ghazlāwī1