- Lutheran Church--Controversial literature1
- Lutheran Church--Controversial literature--Catholic authors1
- Magic--Religious aspects--Christianity1
- Magnificat (Music)1
- Manicules1
- Manuel I, King of Portugal, 1469-15211
- 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