Giovanni Dario (Latin: Johannes Darius, Greek: Ἰωάννης Δαρεῖος; 1414–1494)[1] was a Venetian official who served multiple times as ambassador of the Republic of Venice. His family hailed from Crete, a Venetian colony at the time; his knowledge of Greek allowed him to serve as interpreter and envoy to Constantinople during the last years of the Byzantine Empire. After the Fall of Constantinople he rose to the position of secretary of the Duke of Crete, and from 1464 entered service with the Signoria of Venice. He was repeatedly sent as ambassador to the court of the Ottoman Empire and the Mamluk Sultanate, most notably helping conclude the First Ottoman–Venetian War in 1479.