The Orco (, that is lit. Water of gold; ) is an Italian river. It originates in the Piedmontese slopes of Gran Paradiso and after about reaches the Po river near Chivasso, in the Metropolitan City of Turin. Its drainage basin is home to the most important complex of hydropower in Piedmont, consisting of six major dams (Agnel, Serrù, Ceresole Reale, Teleccio, Piantonetto, Valsoera), many smaller reservoirs and numerous turbines and power stations.