- Luke, Saint1
- Magic--Religious aspects--Christianity1
- Manichaeism1
- Manuscripts, Arabic1
- Manuscripts, Digital1
- Manuscripts, English1
- Manuscripts, European1
- Manuscripts, German1
- Manuscripts, Greek1
- Manuscripts, Greek (Medieval and modern)1
- Manuscripts, Persian1
- Manuscripts, Spanish1
- Manuscripts, Syriac1
- Martyrs1
- Mass--Celebration1
- Massachusetts--Wellesley1
- Massachusetts--Williamstown1
- Maximus, of Turin, Saint, active 4th century-5th century1
- Medicine, Medieval1
- Medicine--Formulae, receipts, prescriptions1