- Manuscripts, Czech1
- Manuscripts, Digital1
- Maps1
- Margaret, Queen, consort of James IV, King of Scotland, 1489-15411
- Margaret, of Antioch, Saint1
- Marina, Saint1
- Marriage customs and rites, Medieval1
- Marriage law1
- Marriage--Moral and ethical aspects1
- Martino, Odino S., active 15th century1
- Martyrologies1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Masorah1
- Mass--Celebration1
- Mathematics, Medieval1
- Matthias I, King of Hungary, 1443-14901
- Maurice, Saint, -approximately 2871
- Maximus, of Turin, Saint, active 4th century-5th century1
- Mechanics1
- Medea, consort of Aegeus, King of Athens (Mythological character)1