Torfinnsvatnet is a lake in Voss Municipality in Vestland county, Norway. The 6.41 square kilometres (2.47 sq mi) lake lies about 1.7 kilometres (1.1 mi) east of the lake Hamlagrøvatnet. The lake has a dam on the west side, which keeps the water level regulated for the local hydroelectric power plants. The river Torfinno connects the lake to the nearby lake Hamlagrøvatnet.