The Ilisos or Ilisus (, ) is a river in Athens, Greece. Originally a tributary of the Kifisos, it has been rechanneled to the sea. It is now largely channeled underground, though as of June 2019 there were plans to unearth the river. Together with the neighbouring river Kifisos, it drains a catchment area of 420 km2.

Etymology

Its name is in all probability Pre-Greek:

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