- Mathematics1
- 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
- Missouri--Saint Louis1
- Monasteries1
- Monasterio de Villaverde de Sandoval1
- Monastic and religious life1
- Monasticism and religious orders1
- Monasticism and religious orders--Rules1
- Montalvan, Alonso de1