- Marriage customs and rites, Medieval1
- Marriage law1
- Marriage--Annulment (Islamic law)1
- Martino, Vanni di1
- Martyrologies1
- Mary, Blessed Virgin, Saint6
- Mashāriq al-anwār (Ṣaghānī, al-Ḥasan ibn Muḥammad)1
- Masjid al-Aqṣá (Jerusalem)2
- Masorah1
- Massachusetts--Boston46
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- Mathematics3
- Mathematics, Arab5
- Maydūmī, Muḥammad ibn Muḥammad, -13531
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- Maḥzor. Yom Kippur1
- Medici, Bernardo d'Alamanno de'1