- Matthei, Bernardino1
- Maurice, Saint, -approximately 2871
- Maximus, of Turin, Saint, active 4th century-5th century1
- Mecco, Francesca di1
- Mecco, Xalento di1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medici, Bernardo d'Alamanno de'1
- Medici, Giovenco de'1
- Medici, Giuliano de'1
- Medici, Lorenzo di Pierfrancesco de', 1463-15031
- Medici, Raffaele de'1
- Medici, Vanne de'1
- Medicine--Formulae, receipts, prescriptions1
- Medicine--Study and teaching1
- Mellini, Piero1
- Memory1
- Merlin (Legendary character)1
- Metalli, Giuliano1
- Metaphysics1
- Meteorologica (Aristotle)1