- Marriage--Religious aspects--Islam2
- Martini, Cornelia2
- Martini, Giovanni2
- Martini, Roberto2
- Mary, Blessed Virgin, Saint, in the liturgy2
- Mary,--Blessed Virgin, Saint2
- Maurice, Saint, -approximately 2872
- Medici, Bernardo d'Alamanno de'2
- Medici, Giovanni de'2
- Medici, Luisa de'2
- Medicine, Greek and Roman2
- Mensural notation2
- Mexico2
- Military history, Medieval2
- Military religious orders2
- Mirqāt al-wuṣūl (Hüsrev, Molla)2
- Misogyny2
- Missions2
- Mnemonics2
- Monastic and religious life (Buddhism)2