Turumtaykul, also spelled Turumtaikul, is a freshwater mountain valley lake in Gorno-Badakhshan Autonomous Region, in the south-east Tajikistan, about east of the provincial capital of Khorugh. Lying in the Pamir Mountains at above sea level, it is , and has an area of with a maximum depth of . Its most numerous fish are Sattar snowtrout and False osman. The lake forms part of the Djavshangoz Important Bird Area.