- Manuscripts, German1
- Manuscripts, Spanish1
- Maps1
- Marbled paper bindings1
- Marie de Médicis, Queen, consort of Henry IV, King of France, 1573-16421
- Martini, Luca, 1980-1
- Marucelli, Benedetto1
- Marucelli, Francesco, 1625-17031
- Mary, Queen of Scots, 1542-15871
- Mathematical recreations1
- Maurice, Saint, -approximately 2871
- Maximian, Emperor of Rome, approximately 240-3101
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical care1
- Medical education1
- Medici, Bastiano de'1
- Medici, Bernardo d'Alamanno de'1
- Medici, Carlo Bernardo Alamanni de'1
- Medici, Fernando de'1
- Medici, Giuliano de', 1453-14781