Echephylidas the Historian was an obscure Greek historian of the early Hellenistic period, active in the 4th or 3rd century BCE. No biographical details about his life survive. The fragmentary evidence suggests he was active after the time of Alexander the Great, as one surviving reference pertains to events in Caria.

His only known work is On Rhodes, a historical text that survives only through citations by later authors. He is significant as a source of fragmentary historical information preserved within these works. The geographer Strabo quotes his On Rhodes concerning the founding of the city and the territorial divisions among its three ancient cities: Lindos, Ialysos, and Kamiros.

This places Echephylidas within the tradition of local historians, or horographers, who documented regional histories and foundation myths. His fragments contribute to the modern understanding of Rhodian tradition and local historiography.