The Evinos (Greek: Εύηνος) is a 92 km long river in western Greece, flowing into the Gulf of Patras. Its source is in the northern Vardousia mountains, near the village Artotina, Phocis. The river flows in a generally southwestern direction, for most of its length in Aetolia-Acarnania. It feeds the reservoir of Lake Evinos, that is about 10 km². The river flows through a deep forested valley with few small villages. In its lower course it flows through lowlands, and it empties into the Gulf of Patras 10 km southeast of Missolonghi.