Former Owner
- Martin Schøyen3
- Mary W. T. Dickinson4
- Matteo Barresi1
- Matteo Luigi Canonici2
- Mayfair Rare Books and Manuscripts1
- Mazliah Finzi1
- Mercantile Library Company1
- Michael Greenberg2
- Michael Tomkinson1
- Michel Ferdinand d'Albert d'Ailly1
- Milton Fischmann10
- Monastero di Santo Spirito in Verona1
- Morris Jastrow, Jr.1
- New York Academy of Medicine7
- Nicholai von Bodeck1
- Nicolas Antoine Labbey de Billy1
- Noël Pinelli1
- Ohio State University Center for Epigraphical and Palaeographical Studies1
- Oliver R. Barrett2
- Otto Ege22