- Manuscripts, German12
- Manuscripts, Italian37
- Manuscripts, Latin169
- Manuscripts, Latin (Medieval and modern)380
- Manuscripts, Medieval255
- Manuscripts, Nahuatl4
- Manuscripts, Portuguese1
- Manuscripts, Purépecha1
- Manuscripts, Quiché1
- Manuscripts, Renaissance150
- Manuscripts, Spanish17
- Manuscripts, Tzutuhil1
- Marginalia3
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Maronite rite (Catholic Church)4
- Maronite rite (Catholic Church)--Liturgy5
- Marriage (Canon law)1
- Marriage (Canon law)--Dispensations1
- Marriage--Moral and ethical aspects1
- Martyrdom1