- Manuscripts, Latin (Medieval and modern)146
- Manuscripts, Medieval257
- Manuscripts, Provençal7
- Manuscripts, Renaissance66
- Manuscripts, Spanish1
- Manuscripts, Turkish1
- Manuscripts, Yiddish1
- Maps3
- Marbled paper bindings1
- Margaret, of Antioch, Saint2
- 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