Former Owner
- Martin Breslauer1
- Matteo Barresi1
- Mayfair Rare Books and Manuscripts1
- Mazliah Finzi1
- Melk Abbey1
- Mercantile Library Company1
- Michael Bernays1
- Michael Tomkinson1
- Michel Chasles1
- Michel Ferdinand d'Albert d'Ailly1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Monastery at San Gregorio al Celio1
- Monastery of San Bartolmeo, Arezzo, Tuscany1
- Moritz Dessauer1
- Nanna Corbinello1
- Nathaniel Sherman Bouton1
- Nicholai von Bodeck1
- Nicholas B. Scheetz1
- Nicolas Antoine Labbey de Billy1
- Novalesa Abbey1