- Marshals1
- Martyrdom1
- Martyrs1
- Marucelli, Benedetto1
- Marucelli, Francesco, 1625-17031
- Mary, Blessed Virgin, Saint22
- Mary, of Bethany, Saint1
- Mass1
- Massachusetts--Boston7
- Massachusetts--Wellesley1
- Massachusetts--Williamstown2
- Materia medica1
- Mathematical instruments1
- 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
- Meditations2
- Mendoza, Antonio de, approximately 1492-15521