- Marriage--Moral and ethical aspects1
- Martini, Luca, 1980-1
- Martinus, Polonus, -12791
- Mary, of Bethany, Saint1
- Mass (Music)1
- Massacre of the Holy Innocents in art1
- Mathematical recreations1
- Mathematics, Medieval1
- Matthei, Bernardino1
- Maurice, Saint, -approximately 2871
- Maximus, of Turin, Saint, active 4th century-5th century1
- Małogoszcz (Poland)1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical astrology1
- Medical formularies1
- Medici, Alamanno de'1
- Medici, Carlo de'1
- Medici, Francesca de'1
- Medici, Ottavia Altoviti1
- Medici, Vincenzo de'1