- Maximian, Emperor of Rome, approximately 240-3101
- Maximus, of Turin, Saint, active 4th century-5th century1
- Maʻariv1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical education1
- 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, Lorenzo de', 1449-14921
- Medici, Nicolo de'1
- Medici, Piero di Lorenzo de', 1472-15031
- Medicine, Ancient1
- Mediterranean Sea--Adriatic Sea1
- Memory1
- Mensural notation1
- Mercy1
- Merit (Jewish theology)1
- Meteorologica (Aristotle)1