Lelång is a lake in the Swedish communities Årjäng and Bengtsfors in the province of Dalsland. The lake is up to 58 meters deep, extends over an area of 52.9 square kilometers and is 93.1 m above sea level. The lake is drained by the Upperudsälven watercourse.
The lake is long and narrow and stretches from Lennartsfors in the north to Bengtsfors in the south and is therefore about 40 km long. The lake has locks at three points: in Lennartsfors there is a lock to the Foxen, in Gustavsfors to the Västra Silen and in Bengtsfors to the Bengtsbrohöljen. In addition, five kilometers north of Bengtsfors there is an open connection without locks to the lake Ärtingen. The Lelång is part of the Dalsland Canal.