Korythio (Greek: Κορύθιο) is a former municipality in Arcadia, Peloponnese, Greece.

Since the 2011 local government reform it is part of the municipality Tripoli, of which it is a municipal unit.

The seat of the municipality was in Steno.

Other villages in the municipal unit are Agiorgitika, Elaiochori, Neochori, Partheni, and Zevgolateio.

This Peloponnese location article is a stub.