- Luke, Saint1
- Lumbres, Ernulfus de1
- Magi1
- Magic1
- Magistrates, Roman1
- Magna Carta1
- Majolus, Saint, Abbot of Cluny, approximately 906-9941
- Manuscripts, Czech1
- Manuscripts, Dutch1
- Manuscripts, Greek1
- Manuscripts, Greek (Medieval and modern)1
- Marbled paper bindings1
- Marina, Saint1
- Marriage customs and rites, Medieval1
- Marriage law1
- Marriage--Moral and ethical aspects1
- Martino, Odino S., active 15th century1
- Martyrologies1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mass--Celebration1