Fretheimsdalsvatnet is a lake in the municipality of Aurland in Sogn og Fjordane county, Norway. The 3.88-square-kilometre (1.50 sq mi) lake is located at an elevation of 929 metres (3,048 ft) above sea level. Fretheimsdalsvatnet is located at the end of the Låvisdalen valley, about 11 kilometres (6.8 mi) southeast of Aurlandsvangen, about 7 kilometres (4.3 mi) southeast of Flåm, and about 6 kilometres (3.7 mi) northeast of Myrdal Station.