Cleonae or Kleonai () was a city in ancient Peloponnesus, described by writers of the Roman period as a city of Argolis, but never included in the Argeia or territory of Argos, in the flourishing period of Greek history. Cleonae was situated on the road from Argos to Corinth, at the distance of 120 stadia from the former city, and 80 stadia from the latter.
Cleonae, located strategically on a road connecting Argos and Corinth, was identified as belonging to Argolis by Roman writers, despite not being included in the territories of Argeia or Argos during the flourishing period of Greek history.