- Manuscripts, European1
- Manuscripts, German1
- Manuscripts, Nahuatl1
- Marginalia1
- Martyrs1
- Massachusetts--Wellesley1
- Maximus, of Turin, Saint, active 4th century-5th century1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medicine--Formulae, receipts, prescriptions1
- Michael (Archangel)1
- Michigan--Kalamazoo1
- Middle East--Jerusalem1
- Midrash1
- Miscellanea1
- Missals1
- Monasticism and religious orders1
- Monasticism and religious orders--Rules1
- Monenergism1
- Musical notation1
- Muslims--Conduct of life1