Lake Kastraki (Greek: Λίμνη Καστρακίου) is an artificial lake near Kastraki in Aetolia-Acarnania, western Greece.

The lake is drained by the river Acheloos, and fed by the rivers Acheloos and Inachos.

[1] It was formed by the Kastraki Dam, completed in 1969.

Its area is about 28 km2 and its maximum capacity is 950,000,000 m³ of water.

It is used for the generation of hydroelectric power by DEI.