- Marriage (Roman law)1
- Martial1
- Martini, Luca, 1980-1
- Martino, Odino S., active 15th century1
- Martyrologies1
- Martyrs1
- Mary Magdalene, Saint1
- Mass--Celebration1
- Massacre of the Holy Innocents in art1
- Masses1
- Masses, Unaccompanied1
- Mathematical recreations1
- Mathematics1
- Mathematics, Greek1
- Maximus, of Turin, Saint, active 4th century-5th century1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical education1
- Medici, Alamanno de'1
- Medici, Bernardo d'Alamanno de'1
- Medici, Camillo de'1