Rauddalsvatnet is a lake in Skjåk Municipality in Innlandet county, Norway. The 7.4977 km2 lake lies just outside the Reinheimen National Park (which surrounds the lake on three sides. The lake sits at an elevation of 916 m above sea level and it has a perimeter of 22.23 km. The lake sits in a narrow valley with the mountain Skridulaupen to the north and Dyringshøi to the south. The lake lies in an isolated valley, about 25 km west of the village of Bismo.