Former Owner
- Maria Riddell1
- Marie Cleophe de Sollario1
- Marie de Albano1
- Marienstiftsgymnasium1
- Markus Fugger1
- Marquis of Astorga1
- Marsden J. Perry1
- Mary Augusta Strachey1
- Mary Lusher1
- Mary Shalom Karo1
- Mary W. T. Dickinson2
- Marāṭha, Raṅganātha1
- Matteo Luigi Canonici9
- Matthaeus Lupin1
- Matthew Donadski1
- Mauni, Bālaṃbhaṭa1
- Maximilian Henry of Bavaria1
- Mayer Sulzberger4
- Mazliah Finzi1
- Maḥmūd al-Ustādār, d. 1396 or 71