Former Owner
- Mary Augusta Strachey1
- Mary Schell Collins1
- Matteo Luigi Canonici1
- Maximilian Henry of Bavaria1
- Merlemont family1
- Michael M. Zagayski1
- Michiel family1
- Morris Jastrow, Jr.1
- Mortimer Frank1
- Mr. Hals1
- Museo Cavaleri1
- Nancy McGrath1
- Nettie Goldsmith Naumburg1
- Neustift Abbey1
- New York Academy of Medicine1
- Nicolas Antoine Labbey de Billy1
- Notre-Dame monastery (Ambert, France)1
- Oliver Henry Perkins1
- Oliver R. Barrett1
- Omaha Public Library1