- Manuscripts, Digital1
- Manuscripts, Japanese1
- Manuscripts, Medical1
- Marbled calf bindings1
- Marbled paper bindings1
- Margaret, of Antioch, Saint1
- Marina, Saint1
- Mark, Saint1
- Marriage (Roman law)1
- Marriage--Moral and ethical aspects1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mary, Blessed Virgin, Saint, in the liturgy--Orthodox Eastern Church1
- Masses1
- Masses, Unaccompanied1
- Mathematics, Greek1
- Maximian, Emperor of Rome, approximately 240-3101
- Maximus, of Turin, Saint, active 4th century-5th century1
- Maḥzor. Yom Kippur1
- Medici, Bernardo d'Alamanno de'1
- Medici, House of1