Lago Bianco (literally "White Lake" in Italian) is a reservoir at the Bernina Pass in the Swiss canton of Graubünden.

It has an elevation of 2,234 m (7,329 ft), a length of 2.85 km (1.77 mi), a surface area of 1.50 km2 (0.58 sq mi) and a maximum depth of 53 m (174 ft). Once the site of two smaller lakes (Lago Bianco and Lago della Scala), the current reservoir was formed by the constructions of two dams (Scala and Arlas) at its southern and northern ends. The current lake drains to the south, as did both its precursor lakes, with its water eventually reaching the Mediterranean via the rivers Poschiavino , Adda and Po. By contrast, Lej Nair, just below the northern dam. drains north into the Black Sea via the rivers Inn and Danube .