- Mayenne, Charles de Lorraine, Duc de, 1554-16111
- Medici, Alessandro de', 1510-15371
- Medici, House of1
- Medici, Lorenzo de', 1449-14921
- Medicine, Magic, mystic, and spagiric1
- Medina, Francisco de, 1544-16151
- Middle Ages1
- Middle East--Jerusalem1
- Missouri--Saint Louis1
- Monastic and religious life1
- Monasticism and religious orders for women1
- Moneylenders1
- Montserrat (Abbey)1
- Mugiello (Italy)1
- Music--Manuscripts1
- Mántica family1
- Oregon--Eugene1
- Painted bindings1
- Paleography1
- Part books1