- Massaran, Isaac de1
- Massi, Francesca1
- Mathematical recreations1
- Mathematics, Medieval1
- Mattei, Teo1
- Matteo, Bernardo di1
- Matteo, Giovanni di1
- Matthei, Bernardino1
- Maurice, Saint, -approximately 2871
- Maximus, of Turin, Saint, active 4th century-5th century1
- Małogoszcz (Poland)1
- Mecco, Francesca di1
- Mecco, Xalento di1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical astrology1
- Medical education1
- Medici, Bernardo de'1
- Medici, Camillo de'1
- Medici, Carlo Bernardo Alamanni de'1
- Medici, Carlo de'1