Former Owner
- Mary Shalom Karo1
- Mary Stanley, Countess of Derby1
- Mary Talbot, Countess of Shrewsbury1
- Mary, Queen of Scots1
- Mathias Schurer1
- Matteo Barresi1
- Matthew Bloxam1
- Matthew Hale1
- Matthew Simpson Parkhurst1
- Matthias Corvinus1
- Mauni, Bālaṃbhaṭa1
- Maurice Johnson1
- Maurice Kann1
- Maurilio Morazio1
- Mayfair Rare Books and Manuscripts1
- Mazliah Finzi1
- Maḥmūd al-Ustādār, d. 1396 or 71
- McCormick Theological Seminary1
- Medingen Abbey1
- Menno Hertzberger1