- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical astrology1
- Medici, Alamanno de'1
- Medici, Bernardo de'1
- Medici, Giuliano de'1
- Medici, Lorenzo de', 1449-14921
- Medici, Vanne de'1
- Medicine, Magic, mystic, and spagiric1
- Medicine, Persian1
- Meditations1
- Mediterranean Region1
- Mellini, Piero1
- Metalli, Giuliano1
- Meteorologica (Aristotle)1
- Methodology1
- Michele, Lapo di1
- Michele, Maso di1
- Michele, Niccolò di1
- Miftāḥ al-ʻulūm (Sakkākī, Yūsuf ibn Abī Bakr)1
- Miniato, Colombino1