- Marucelli, Benedetto1
- Marucelli, Francesco, 1625-17031
- Mary, of Bethany, Saint1
- Mass1
- Materia medica1
- Mathematical instruments1
- Mathematics1
- Mayan languages1
- Mayenne, Charles de Lorraine, Duc de, 1554-16111
- Medina Sidonia, Alonso Pérez de Guzmán, duque de, 1550-16191
- Medina Sidonia, Juan Alonso de Guzmán, Duque de, -15581
- Medina, Francisco de, 1544-16151
- Meditations1
- Mensural notation1
- Merchants1
- Mexico--Chiapas1
- Mexico--Mexico City1
- Mexico--Michoacán de Ocampo1
- Missions1
- Missions, Portuguese1