Former Owner
- Michiel family1
- Mikhail Golitsyn1
- Millard Meiss1
- Molin1
- Monasterium sanctorum quadraginta martyrum (Treviso Italy)1
- Moritz Joseph Johann von Dietrichstein1
- Morris Jastrow, Jr.1
- Murray Anthony Potter1
- Nathaniel Sherman Bouton1
- Nettie Goldsmith Naumburg1
- Niccolò Albergati1
- Nicolai Briganti1
- Nicolaus de Monte Murro1
- Norman H. Strouse1
- Novalesa Abbey1
- Oliver Henry Perkins1
- Omaha Public Library1
- Orlandus de Fatiis1
- Otto Jahn1
- Otto Vollbehr1