- Maritime law2
- Marriage (Canon law)2
- Martini, Cornelia2
- Martini, Giovanni2
- Martini, Roberto2
- Martyrdom--Islam2
- Mary, Blessed Virgin, Saint, in the liturgy2
- Mary, Queen of Scots, 1542-15872
- Materia medica, Animal2
- Matsliaḥ, ha-Kohen, 12th century2
- Maurice, Saint, -approximately 2872
- Maḥzor. Yom Kippur2
- Medici, Bernardo d'Alamanno de'2
- Medici, Giovanni de'2
- Medici, Lorenzo de', 1449-14922
- Medici, Luisa de'2
- Medicine--Study and teaching2
- Menologion (Orthodox Eastern Church)2
- Menstruation--Religious aspects--Islam2
- Messiah--Judaism2