- Mandeville, John, Sir1
- Manners and customs1
- Manuscripts, Armenian1
- Manuscripts, Czech1
- Manuscripts, European1
- Manuscripts, Greek1
- Martino, Odino S., active 15th century1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mass--Celebration1
- Massachusetts1
- Massachusetts--Northampton1
- Materia medica, Vegetable1
- Mathematics1
- Mathematics, Arab1
- Mathematics, Greek1
- Mathematics, Medieval1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medicinal plants1
- Medicine, Greek and Roman1
- Medicine, Greek and Roman--Manuscripts1