Hydai or Kydai was a town of ancient Caria. Its name does not appear in ancient authors, but is inferred from epigraphic evidence; its demonym was Hydaieis () or Kydaieis (ÃÂàôñùÃ栨ÂÃÂ). It was a polis (city-state) and a member of the Delian League.
Its site is located near DamlarboÃÂaz, Asiatic Turkey. It has been partially excavated and some of the artifacts are displayed at the Milas Museum.