Sau Reservoir (Catalan: Pantà de Sau) is a reservoir located on the Ter river, near Vilanova de Sau, Catalonia, Spain.
The dam was completed in 1962, creating a reservoir with a storage capacity of 151.3 hm³ that covered the former town of Sant Romà de Sau.
The Church of Sant Romà is still visible when the water level is low.
The dam has a structural height of 83 m and a crest length of 260 m.
