Helin is a lake which lies in the municipalities of Vestre Slidre and Vang in Oppland county, Norway. The lake is regulated for power production by Åbjøra kraftverk. Helin has an area of 9,47 km² and its circumference is 27.17 km. It is located at 870 m above the sea, and has a volume of 18.6 million m³. In 1930 a 35 km² area between Helin and the Syndin lakes to the east was recognized as a botanical plant national park.