Totak is a lake in the municipality of Vinje in Vestfold og Telemark county, Norway. The lake is part of the Skien river watershed (Skiensvassdraget), discharging via the river Tokke to lake Bandak. At 306 m Totak is the 10th deepest lake in Norway; this tremendous overdeepening marks it as a glacially formed lake with characteristics similar to a fjord. Its volume of 2.36 km3 makes it the 20th largest by volume as well. It is part of the Tokke Hydroelectric Power Station.