- Medici, Nicolo de'1
- Medici, Ottavia Altoviti1
- Medici, Piero di Lorenzo de', 1472-15031
- Medici, Raffaele de'1
- Medicinal plants1
- Medicine, Magic, mystic, and spagiric1
- Medicine, Medieval1
- Medicine--Study and teaching1
- Mediterranean Region1
- Meistersinger1
- Melanchthon, Philip, 1497-1560. De officio principum1
- Meteorologica (Aristotle)1
- Metochites, Theodoros, 1270-13321
- Mexico--Culhuacán1
- Mexico--San Juan Teotihuacán1
- Mexico--San Juan Teotihuacán--Teotihuacán Site1
- Mexico--Temascaltepec1
- Mexico--Tulancingo Region (Hidalgo)1
- Michele, Lorenzo de'1
- Michele, Olivo di1