Dius was a Hellenistic historian of Phoenicia, likely active in the 3rd or 2nd century BCE. No biographical details survive; his existence and work are known solely from later citations.

His only known work is the lost Phoenician History, preserved in fragments. These fragments are transmitted through citations by the Jewish historian Josephus in his work Against Apion and by the Christian writer Tatian.

Dius’s significance lies in his value as a source for Phoenician history and mythology, particularly concerning the city of Tyre. Josephus quoted him to correlate Phoenician king-lists with biblical chronology, using Dius to support the historical antiquity of the Jewish people. His fragments preserve traditions about King Hiram of Tyre and his dealings with King Solomon, exemplifying the local historiography of the Hellenistic period.