Menmecho Lake is a mountain lake located in East Sikkim district in the state of Sikkim, India. It lies on the way to the Jelepla Pass and is situated at a distance of 20 kilometres (12 mi) ahead of the Tsongmo Lake. It is the source of the river Rangpo chu, a tributary of the River Teesta. The waters of the lake are sourced by melting snow in summer, and the monsoons in the rainly season.
The lake is famous for its trout, and has a large fishfarm nearby with a guesthouse. Menmecho is closed to tourists.