- Medical care1
- Medical formularies1
- Medici, Piero di Lorenzo de', 1472-15031
- Medicine, Magic, mystic, and spagiric1
- Medicine, Persian1
- Medina Sidonia, Alonso Pérez de Guzmán, duque de, 1550-16191
- Medina Sidonia, Juan Alonso de Guzmán, Duque de, -15581
- Medina, Francisco de, 1544-16151
- Memory1
- Mesgissier, Martin le1
- Meteorologica (Aristotle)1
- Metochites, Theodoros, 1270-13321
- Mexico--Chiapas1
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- Mexico--Michoacán de Ocampo1
- Mexico--Perote1
- Mexico--Temascaltepec1
- Mexico--Tulancingo Region (Hidalgo)1
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- Michael (Archangel)1