- Mass--Celebration1
- Medici, Lorenzo de', 1449-14921
- Medicine--Study and teaching1
- Mendoza, Antonio de, approximately 1492-15521
- Mexico--San Juan Teotihuacán1
- Mexico--San Juan Teotihuacán--Teotihuacán Site1
- Mexico--Zumpango (Municipio)1
- Michelangelo Buonarroti, 1475-15641
- Mineral industries1
- Miners1
- Mines and mineral resources1
- Mining law1
- Miracles1
- Missions1
- Monardes, Nicolás, approximately 1512-15881
- Montúfar, Alonso de, active 1512-15701
- Morales family1
- Morales, Andrés de, active 1683-16851
- Morales, Francisco de, active 1683-16851
- Morales, Nicolás de, active 1683-16851