Former Owner
- Maurice Johnson1
- Maurilio Morazio1
- Maximilian Henry of Bavaria1
- Mayer Sulzberger2
- Mazliah Finzi1
- Maḥmūd bin Nāṣir1
- Maḥmūd ibn al-Shaykh al-Fattāḥ1
- McCormick Theological Seminary1
- Melchior Daniel Neubronner1
- Melk Abbey1
- Menaḥem Naḥum, ha-Leṿi, mi-ḳ.ḳ. Dribin1
- Michael Tomkinson1
- Michaeliskonvent1
- Michel Chasles1
- Michele Amari1
- Michiel family1
- Miguel de Mayora1
- Millard Meiss1
- Milt Freudenheim1
- Milton Fischmann24