Lake Czorsztyn (Polish: Jezioro Czorsztyńskie) is a man-made reservoir on the Dunajec river, southern Poland, between the Pieniny and the Gorce Mountains.

It exists due to a dam in the village of Niedzica.

The lake has the area ranging from 4.15 square kilometres (1.60 sq mi) to 13.35 square kilometres (5.15 sq mi).

Main purpose of the reservoir is to prevent floods in the Dunajec river valley.

The lake is located in close proximity of several popular tourist spots, such as Pieniny National Park, Niedzica Castle, Czorsztyn Castle, and the tourist village of Kluszkowce.