- Medici, Lorenzo di Pierfrancesco de', 1463-15031
- Medici, Luisa de'1
- Medici, Niccolo de'1
- Medici, Nicolo de'1
- Medici, Piero di Lorenzo de', 1472-15031
- Medici, Raffaele de'1
- Medicinal plants1
- Medicine, Arab1
- Medicine, Persian1
- Medicine--Study and teaching1
- Medina Sidonia, Alonso Pérez de Guzmán, duque de, 1550-16191
- Medina Sidonia, Juan Alonso de Guzmán, Duque de, -15581
- Medina, Francisco de, 1544-16151
- Mediterranean Sea1
- Meistersinger1
- Mendoza, Antonio de, approximately 1492-15521
- Metochites, Theodoros, 1270-13321
- Mexico--Culhuacán1
- Mexico--Perote1
- Mexico--Veracruz-Llave (State)1