- Manuscripts, Portuguese2
- Maritime law2
- Martini, Cornelia2
- Martini, Giovanni2
- Martini, Roberto2
- Mass--Celebration2
- Materia medica, Vegetable2
- Mathematics, Greek2
- Medea, consort of Aegeus, King of Athens (Mythological character)2
- Medici, Alamanno de'2
- Medici, Bernardo d'Alamanno de'2
- Medici, Giovanni de'2
- Metal clasps2
- Michael (Archangel)2
- Military history, Medieval2
- Miniature books2
- Monasteries2
- Monasticism and religious orders--Middle Ages2
- Money2
- Monte di pietà (Florence, Italy)2