- Martyrs1
- Mary Magdalene, Saint4
- Mary, Blessed Virgin, Saint35
- Mass11
- Mass (Music)1
- Mass--Celebration1
- Massachusetts--Boston10
- Massachusetts--Northampton5
- Massachusetts--Wellesley12
- Massachusetts--Williamstown2
- Maurice, Saint, -approximately 2871
- Małogoszcz (Poland)1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medicinal plants1
- Medicine2
- Medicine, Magic, mystic, and spagiric1
- Medicine--Formulae, receipts, prescriptions1
- Meditations6
- Mehmed II, Sultan of the Turks, 1432-14811
- Melanchthon, Philip, 1497-1560. De officio principum1