Vasslivatnet is a lake in the municipality of Hemne in Sør-Trøndelag county, Norway. The 2.92-square-kilometre (1.13sqmi) lake lies along the highway E39, about 13 kilometres (8.1mi) east of Vinjeøra. The lake is a man-made lake along the Søo River. There is a dam on the west end that is part of a hydropower plant.