- Marginalia8
- Marie de Médicis, Queen, consort of Henry IV, King of France, 1573-16421
- Marriage1
- Marriage (Canon law)1
- Marriage customs and rites1
- Marriage customs and rites, Medieval1
- Mary Magdalene, Saint1
- Mary, Blessed Virgin, Saint3
- Massachusetts--Boston54
- Massachusetts--Northampton2
- Massachusetts--Williamstown6
- Mathematics, Greek1
- Maḥzor2
- Medicine3
- Medicine, Magic, mystic, and spagiric1
- Medicine, Medieval2
- Medicine--Formulae, receipts, prescriptions1
- Medicine--Study and teaching1
- Meditations3
- Merchants1