Aoös is a river in northwestern Greece.
Its total length is about 272 kilometres (169 mi), of which the first 80 kilometres (50 mi) are in Greece, and the remaining 192 kilometres (119 mi) are in Albania.
Its source is in Greece, specifically in the Pindus mountains in Epirus, near the village of Vovousa. An artificial lake has been constructed at an altitude of 1350 metres, and there is a hydroelectric dam in place since 1987. It flows through the Vikos–Aoös National Park, where it forms impressive canyons. It flows through Konitsa, and enters Albania near Çarshovë. It flows into the Adriatic Sea, northwest of Vlorë.