Sørvágsvatn/Leitisvatn is the biggest lake of the Faroe Islands. It is situated on the island of Vágar between the municipalities of Sørvágs Kommuna and Vága kommuna. The name Sørvágsvatn means 'The lake of Sørvágur'. In size it is 3.4 km2, more than three times the size of the second biggest lake Fjallavatn, which also lies on the island of Vágar.
During World War II the British army built an airfield by the lake. They also built a station to support seaplanes. The first aircraft to land on the lake was a Catalina from the British Navy, which landed on in 1941.