Tsomgo Lake, also known as Tsongmo Lake or Changu Lake, is a glacial lake in the East Sikkim of the Indian state of Sikkim, some from the capital Gangtok. Located at an elevation of , the lake remains frozen during the winter season. The lake surface reflects different colours with change of seasons and is held in great reverence by the local Sikkimese people. Buddhist monks prognosticated after studying the changing colours of the lake.