Former Owner
- Mario Maffei1
- Matteo Barresi1
- Mayfair Rare Books and Manuscripts1
- Melk Abbey1
- Mercantile Library Company1
- Michael Tomkinson1
- Michel Chasles1
- Michel Ferdinand d'Albert d'Ailly1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Monastery of San Bartolmeo, Arezzo, Tuscany1
- Morris Jastrow, Jr.1
- Nanna Corbinello1
- Nathaniel Sherman Bouton1
- New York Academy of Medicine1
- Nicholas B. Scheetz1
- Nicolas Antoine Labbey de Billy1
- Novalesa Abbey1
- Ohio State University Center for Epigraphical and Palaeographical Studies1
- Oliver Henry Perkins1
- Paolo Gallo1