Euphratensis or Augusta Euphratensis, in Greek Euphratesia (Εὑφρατησία), was a Roman province in Greater Syria, part of the late Roman Diocese of the East.
Sometime between 330 and 350 (likely ca. 341), the province of Euphratensis was created out of the territory of Syria Coele along the western bank of the Euphrates. It included the territories of Commagene and Cyrrhestice. Its capital was Cyrrus or perhaps Hierapolis Bambyce.
Episcopal sees of Syria Euphratensis I that are listed in the Annuario Pontificio as titular sees include:
Episcopal sees of Syria Euphratensis II that are listed in the Annuario Pontificio as titular sees include:
- Agrippias (ruins of Saliliyé)