- Maximus, of Turin, Saint, active 4th century-5th century1
- Małogoszcz (Poland)1
- Mecco, Francesca di1
- Mecco, Xalento di1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical astrology1
- Medici, Camillo de'1
- Medici, Carlo Bernardo Alamanni de'1
- Medici, Giovenco de'1
- Medici, Giuliano de'1
- Medici, Lorenzo di Pierfrancesco de', 1463-15031
- Medici, Niccolò de'1
- Medici, Raffaele de'1
- Medici, Vanne de'1
- Mediterranean Sea1
- Melanchthon, Philip, 1497-1560. De officio principum1
- Mellini, Piero1
- Mercy1
- Merlin (Legendary character)1
- Meschiati, Giovanni1