Dyme, or Dymae, was a town and polis (city-state) of ancient Achaea, and the most westerly of the 12 Achaean cities, from which circumstance it is said to have derived its name. The location of Dyme is near the modern Kato Achaia.

Achaea or Achaia is the northernmost region of the Peloponnese, occupying the coastal strip north of Arcadia. Its approximate boundaries are: to the south, Mount Erymanthus; to the south-east, Mount Cyllene; to the east, Sicyon; and to the west, the Larissos river. Apart from the plain around Dyme in the west, Achaea is generally a mountainous region.