|Type||natural lake, reservoir|
|Primary outflows||Gudbrandsdalslågen, Rauma|
|Max. length||10 km|
|Surface area||4.34 km²|
|Surface elevation||611 m|
Lesjaskogsvatnet (literally the Lesja woods lake) is a lake which serves as the headwaters for Gudbrandsdalslågen (literally the Gudbrands valley water course). Gudbrandsdalslågen flows through the Gudbrandsdal valley bottom, ending in lake Mjøsa.
The lake was dammed to serve the Lesja Iron Works in the 1660s and now has two outlets. It flows both East into the Gudbrandsdalslågen and west into the Rauma river in the magnificent Romsdalen valley.