- Marriage--Moral and ethical aspects1
- Married women1
- Mars (Planet)1
- Marshals1
- Martellini, Vincenzio1
- Martial1
- Martini, Girolamo1
- Martini, Luca, 1980-1
- Martino, Barone di1
- Martino, Odino S., active 15th century1
- Martino, Vanni di1
- Martinus, Polonus, -12791
- Martyn, Henry, 1781-18121
- Martyrdom1
- Marucelli, Benedetto1
- Marucelli, Francesco, 1625-17031
- Mary, Blessed Virgin, Saint, and the church1
- Mary, Blessed Virgin, Saint, in the liturgy--Orthodox Eastern Church1
- Mary, of Bethany, Saint1
- Masjid al-Nabawī al-Sharīf1