- Massacre of the Holy Innocents in art1
- Masses1
- Masses, Unaccompanied1
- Materia medica4
- Mathematical recreations1
- Mathematics5
- Mathematics, Greek1
- Mathematics, Jewish1
- Maurice, Saint, -approximately 2871
- Maximian, Emperor of Rome, approximately 240-3101
- Maximus, of Turin, Saint, active 4th century-5th century1
- Maʻariv1
- Maḥzor5
- Meat inspection (Jewish law)2
- Medallions (Decorative arts)1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical care1
- Medical education1
- Medici, Alamanno de'2
- Medici, Alessandro de', 1510-15372