Peraetheis or Peraitheis (Ancient Greek: Περαιθεῖς), or Peraethea or Peraithea, was a town in ancient Arcadia, in the district Maenalia on the river Elaphus.
Its site is located near the modern Arachamites.
37°26′13″N 22°14′13″E / 37.437°N 22.237°E