- Mary, Queen of Scots, 1542-15871
- Mass--Celebration1
- Massachusetts--Wellesley1
- Materia medica1
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medici, Alessandro de', 1510-15371
- Medici, Andrea de'1
- Medici, Giuliano de', 1453-14781
- Medici, Luisa de'1
- Medici, Niccolo de'1
- Medici, Nicolo de'1
- Medici, Piero di Lorenzo de', 1472-15031
- Medicine, Arab1
- Medicine, Medieval1
- Merchants1
- Michigan--Kalamazoo1
- Middle Ages1
- Middle East--Jerusalem1
- Military art and science1
- Military history, Medieval1