Former Owner
- Marienstiftsgymnasium1
- Mark Lansburgh1
- Mary W. T. Dickinson2
- Matthaeus Lupin1
- Matthew Donadski1
- Medingen Abbey1
- Melchior Daniel Neubronner1
- Melk Abbey1
- Menno Hertzberger1
- Michael Greenberg1
- Minerva Kaiser1
- Miriam Lutcher Stark1
- Monastery of Saint Peter (Erfurt, Germany)1
- Mrs. E.J. Hooper1
- N. Pauli1
- New York Academy of Medicine2
- Niccolò Perotti1
- Nicolas Antoine Labbey de Billy1
- Nicolaus Pol1
- Nonnberg Abbey1