- Martial1
- Martini, Cornelia1
- Martini, Giovanni1
- Martini, Roberto1
- Martino, Barone di1
- Martino, Vanni di1
- Marucelli, Benedetto1
- Marucelli, Francesco, 1625-17031
- Mary, Queen of Scots, 1542-15871
- Massachusetts1
- Massachusetts--Northampton1
- Massachusetts--Wellesley1
- Maximilian I, Holy Roman Emperor, 1459-15191
- Mecco, Francesca di1
- Mecco, Xalento di1
- Medallions (Decorative arts)1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical education1
- Medici, Bastiano de'1
- Medici, Carlo Bernardo Alamanni de'1