- Majolus, Saint, Abbot of Cluny, approximately 906-9941
- Man-woman relationships1
- Mandeville, John, Sir1
- Manners and customs1
- Manuscripts, Byzantine1
- Manuscripts, Czech1
- Manuscripts, Digital1
- Manuscripts, Japanese1
- Manuscripts, Medical1
- Marbled calf bindings1
- Marbled paper bindings1
- Margaret, of Antioch, Saint1
- Marina, Saint1
- Mark, Saint1
- Marriage (Roman law)1
- Marriage--Moral and ethical aspects1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mary, Blessed Virgin, Saint, in the liturgy--Orthodox Eastern Church1
- Masses1
- Masses, Unaccompanied1