- Maro, Guglielmo1
- Marriage (Roman law)1
- Marriage customs and rites1
- Marriage customs and rites, Medieval1
- Marriage service1
- Marriage--Religious aspects1
- Mars (Planet)1
- Martellini, Vincenzio1
- Martini, Girolamo1
- Martino, Barone di1
- Martino, Odino S., active 15th century1
- Martino, Vanni di1
- Martinus, Polonus, -12791
- Martyn, Henry, 1781-18121
- Martyrdom1
- Martyrs1
- Marucelli, Benedetto1
- Marucelli, Francesco, 1625-17031
- Mary Magdalene, Saint1
- Mashāʻir (Ṣadr al-Dīn Shīrāzī, Muḥammad ibn Ibrāhīm)1