- Manuscripts, Catalan1
- Manuscripts, Dutch1
- Manuscripts, English1
- Manuscripts, Portuguese1
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Marriage (Canon law)1
- Marriage (Canon law)--Dispensations1
- Marriage--Moral and ethical aspects1
- Mass (Music)1
- Mass--Celebration1
- Massachusetts--Williamstown1
- Maurice, Saint, -approximately 2871
- Małogoszcz (Poland)1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medicinal plants1
- Medicine, Magic, mystic, and spagiric1
- Medicine--Formulae, receipts, prescriptions1
- Mehmed II, Sultan of the Turks, 1432-14811
- Melanchthon, Philip, 1497-1560. De officio principum1
- Mexico--Chiapas1