- Manuscripts, German2
- Manuscripts, Greek (Medieval and modern)1
- Manuscripts, Hebrew75
- Manuscripts, Italian1
- Manuscripts, Judeo-Arabic6
- Manuscripts, Latin19
- Manuscripts, Latin (Medieval and modern)46
- Manuscripts, Medieval54
- Manuscripts, Renaissance6
- Manuscripts, Tamil1
- Manuscripts--Prices1
- Marginalia4
- Mary, Blessed Virgin, Saint19
- Mass1
- Massachusetts--Boston10
- Massachusetts--Wellesley1
- Massachusetts--Williamstown1
- Medicine, Magic, mystic, and spagiric1
- Medicine, Magic, mystic, and spagiric--Formulae, receipts, prescriptions1
- Medicine, Medieval1