- Manuscripts, Catalan1
- Manuscripts, Dutch1
- Manuscripts, English1
- Manuscripts, Nahuatl1
- Manuscripts, Portuguese1
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Marriage (Canon law)1
- Marriage (Canon law)--Dispensations1
- Martyrdom1
- Martyrs1
- Małogoszcz (Poland)1
- Medicine--Formulae, receipts, prescriptions1
- Melanchthon, Philip, 1497-1560. De officio principum1
- Mensural notation1
- Middle East--Jerusalem1
- Missals1
- Missals (Service books)1
- Missions1
- Monasticism and religious orders--Rules1
- Montserrat (Abbey)1