Former Owner
- Marquis of Astorga1
- Marsden J. Perry1
- Mary Augusta Strachey1
- Matteo Luigi Canonici1
- Matthaeus Lupin1
- Maximilian Henry of Bavaria1
- Mayer Sulzberger1
- Melchior Daniel Neubronner1
- Michael Bernays1
- Miriam Lutcher Stark1
- Moritz Joseph Johann von Dietrichstein1
- Mortimer Frank1
- Mr. Hals1
- Muḥammad ʻAwwād ibn Ḥusayn Afandī1
- New York Academy of Medicine1
- Nicholas N. Martinovitch1
- Noël Pinelli1
- Oliver R. Barrett1
- Otto Jahn1
- Peretz ben Yehuda Mintz Ashkenazi1