Dionysodorus of Amisene was a Greek mathematician from Pontus, now on the Black Sea coast of Turkey. He was briefly described by Strabo, as one of the learned men of the city of Amisus. Despite the similarity of his demonym to the inland city of Amaseia, where Strabo was born, translators H. C. Hamilton and W. Falconer instead footnote Amisus as being the modern city Samsun, near Amaseia on the coast. Amisene is a name for the region containing both cities.