Hephaistia

thumb|240px|The ancient theater in Hephaistia

Hephaestia and Hephaistia (), or Hephaestias or Hephaistias (Ἡφαιστίας), was a town of Ancient Greece, now an archeological site on the northern shore of Lemnos, Greek island in the northern Aegean Sea. It was named in the honor of Hephaistos, Greek god of metallurgy, whose cult was maintained on the island. It was once the capital of the island (8th to 6th centuries BCE), of which only the ruins remain.