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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 Lake Tsomgo. It is the source of the river Rangpo chu, a tributary of the Teesta River. The waters of the lake are sourced by melting snow in summer, and the monsoon in the wet season.
The lake is noted for its trout, and has a large fish farm nearby with a guesthouse. Menmecho is closed to tourists.