- Martino, Odino S., active 15th century1
- Marucelli, Benedetto1
- Marucelli, Francesco, 1625-17031
- Massacre of the Holy Innocents in art1
- Mathematics, Greek1
- Maurice, Saint, -approximately 2871
- Maximian, Emperor of Rome, approximately 240-3101
- Maximus, of Turin, Saint, active 4th century-5th century1
- Medici family1
- Medici, Bastiano de'1
- Medici, Bernardo d'Alamanno de'1
- Medici, Carlo Bernardo Alamanni de'1
- Medici, Fernando de'1
- Medici, Giuliano de', 1453-14781
- Medici, Nicolo de'1
- Medici, Piero di Lorenzo de', 1472-15031
- Medicine--Manuscripts1
- Mediterranean Region1
- Mediterranean Sea1
- Mediterranean Sea--Adriatic Sea1