- Mary, Queen of Scots, 1542-15871
- Masorah1
- Mass--Celebration1
- Massachusetts--Northampton1
- Massacre of the Holy Innocents in art1
- Masses1
- Masses, Unaccompanied1
- Mathematical recreations1
- 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
- Medallions (Decorative arts)1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medical care1
- Medical education1
- Medici, Bastiano de'1
- Medici, Bernardo d'Alamanno de'1