Former Owner
- Matteo Barresi1
- Mayfair Rare Books and Manuscripts1
- Mazliah Finzi1
- Melk Abbey1
- Mercantile Library Company1
- Michael Tomkinson1
- Michel Chasles1
- Michel Ferdinand d'Albert d'Ailly1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Monastero di Santo Spirito in Verona1
- Moritz Dessauer1
- Morris Jastrow, Jr.1
- Nanna Corbinello1
- Nicholai von Bodeck1
- Nicolas Antoine Labbey de Billy1
- Noël Pinelli1
- Oliver Henry Perkins1
- Paolo Gallo1
- Paolo Giovio1
- Parroco di Taviano, Luigi Bruno, active 20th century1