Tyin is a lake in Vang Municipality in Innlandet county, Norway.

The lake is located in the southwest part of the Jotunheimen mountain range.

The lake lies in Vang Municipality in Innlandet county, but a small portion of the lake extends into Årdal Municipality in Vestland county.

The 33.2-square-kilometre (12.8 sq mi) lake serves as a reservoir for the Tyin Hydroelectric Power Station and the water level is regulated between 1,082.8 to 1,072.50 metres (3,552.5 to 3,518.7 ft) above sea level.

[2] In 1869, the Norwegian Mountain Touring Association (DNT) built its first cabin, which was located on the shores of Tyin.