Leo Allatius (c. 1586 – January 19, 1669) (Greek: Λέων Αλλάτιος, "Leon Allatios", Λιωνής Αλάτζης, "Lionis Allatzis"; Italian: "Leone Allacci, Allacio"; Latin: "Leo Allatius, Allacius") was a Greek scholar, theologian and keeper of the Vatican library.
Лев Аллаций (1586—1669; греч: Λέων Αλλάτιος, Leon Allatios, Λιωνής Αλάτζης, Lionis Allatzis, ит: Leone Allacci, Allacio, лат: Leo Allatius, Allacius) — писатель, олатинившийся грек.