Tsongmo Lake (also called Changu Lake) is a large lake in East Sikkim district of the Indian state of Sikkim.

Many locals have set up shop at offering yak rides, yak cheese, trinkets, and local curios.

It falls in the restricted area and hence an inner line permit is required by Indians to visit this place. Foreign nationals are not permitted to visit this lake without special permission. The lake is about 1 km. Long, oval in shape, 15 meters deep and is considered sacred by the local people.

A small temple of lord Siva is constructed on the lakeside . This placid lake remains frozen during the winter months up to mid-May.