Hydissus or Hydissos (Ancient Greek: Ὑδισσός), Hydisus or Hydisos (Ὑδισός), or Hydissa (Ὕδισσα) was a town of ancient Caria, situated south of Mylassa. Hydissus was a polis (city-state) and a member of the Delian League.

Its site is located near Karacahisar, Muğla Province, Turkey.

 This article incorporates text from a publication now in the public domain: Smith, William, ed. (1854–1857). "Hydissa". Dictionary of Greek and Roman Geography. London: John Murray.

37°08′20″N 27°48′41″E / 37.138837°N 27.811477°E / 37.138837; 27.811477