- Marriage--Moral and ethical aspects1
- Martini, Giovanni1
- Martini, Girolamo1
- Martino, Barone di1
- Martino, Odino S., active 15th century1
- Martino, Vanni di1
- Mary, Blessed Virgin, Saint, in the liturgy1
- Mary, Blessed Virgin, Saint, in the liturgy--Orthodox Eastern Church1
- Mary, Queen of Scots, 1542-15871
- Massaran, Isaac de1
- Masses1
- Masses, Unaccompanied1
- Massi, Francesca1
- Mattei, Teo1
- Matteo, Bernardo di1
- Matteo, Giovanni di1
- Matthei, Bernardino1
- Maximian, Emperor of Rome, approximately 240-3101
- Maximus, of Turin, Saint, active 4th century-5th century1
- Maḥzor. Yom Kippur1