Former Owner
- Martinus Nijhoff1
- Maurice Kann1
- Maxwell Sommerville1
- Mayfair Rare Books and Manuscripts1
- Middle Hill Rare Books & Manuscripts AB (Stockholm, Sweden)1
- Minerva Kaiser1
- Minnis, Katherine1
- Monsieur de Bel Air1
- Mrs. F. W. Bartlett1
- Muriel Agnes Fry1
- N. Pauli1
- Nicholas Chevalier1
- Nicolas Antoine Labbey de Billy1
- Nicolas Rauch1
- Nicolas Yemeniz1
- Nicolaus Pol1
- Notre-Dame de Macourt monastery1
- Omaha Public Library1
- Otto Haas1
- Parroco di Taviano, Luigi Bruno, active 20th century1