The Inachos (Greek: Ίναχος), also known as Panitsa (Πάνιτσα), is a river in the Peloponnese, southern Greece.

The Inachos was named after Inachus, a mythical king of Argos, who introduced civilization to the area.

Near its sources it receives a tributary called the Cephissus, which rises in Mt.

Artemisium, and which, from its proximity to Argos, has been frequently mistaken for the Inachus by modern travellers.

It was on the banks of the Charadrus that the armies of Argos, on their return from military expeditions, were obliged to undergo a court of inquiry before they were permitted to enter the city.

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