Seleucia at the Zeugma (Greek: Σελεύκεια ἐπὶ τοῦ Ζεύγματος, transliterated Seleucia epi tou Zeugmatos or Seleukeia epi tou Zeugmatos) was a Hellenistic city or fortified town in the present Republic of Turkey, on the left, or south, bank of the Euphrates, across from ancient Samosata and not far from it.