- Magistrates, Roman1
- Magna Carta1
- Majolus, Saint, Abbot of Cluny, approximately 906-9941
- Manuscripts, Czech1
- Manuscripts, Dutch1
- Manuscripts, Greek1
- Manuscripts, Greek (Medieval and modern)1
- Marbled paper bindings1
- Marina, Saint1
- Marriage customs and rites, Medieval1
- Marriage law1
- Marriage--Moral and ethical aspects1
- Martino, Odino S., active 15th century1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mass--Celebration1
- Mathematics, Greek1
- Mathematics, Medieval1
- Maurice, Saint, -approximately 2871
- Maximus, of Turin, Saint, active 4th century-5th century1
- Medea, consort of Aegeus, King of Athens (Mythological character)1