- Manuscript waste1
- Manuscripts, Catalan1
- Manuscripts, Czech1
- Manuscripts, English1
- Manuscripts, Greek (Medieval and modern)1
- Manuscripts, Provençal1
- Marriage1
- Martyrologies1
- Martyrs1
- Mary Magdalene, Saint1
- Massachusetts--Williamstown1
- Masses1
- Masses, Unaccompanied1
- Materia medica1
- Maurice, Saint, -approximately 2871
- Maximian, Emperor of Rome, approximately 240-3101
- Medea, consort of Aegeus, King of Athens (Mythological character)1
- Medici, Bernardo d'Alamanno de'1
- Medici, House of1
- Medicine, Arab1