- Mariano, Fra1
- Marie de Médicis, Queen, consort of Henry IV, King of France, 1573-16421
- Marriage (Roman law)1
- Martini, Luca, 1980-1
- Mary Magdalene, Saint1
- Mary, Queen of Scots, 1542-15871
- Mass1
- Materia medica, Vegetable1
- Mathematical recreations1
- Maurice, Saint, -approximately 2871
- Maximian, Emperor of Rome, approximately 240-3101
- Maximilian I, Holy Roman Emperor, 1459-15191
- Medical astrology1
- Medici, Bernardo d'Alamanno de'1
- Medici, Giuliano de', 1453-14781
- Medici, Lorenzo de', 1449-14921
- Medici, Piero di Lorenzo de', 1472-15031
- Medicinal plants1
- Medicine, Greek and Roman1
- Meditations1