Khoton Lake (Mongolian: Хотон нуур, Chinese: 霍屯湖, 和屯湖) is a freshwater lake in Altai Tavan Bogd National Park in Bayan-Ölgii Province, western Mongolia.

It lies at the foot of the Altai Mountains near the Chinese border, at an elevation of about 2,000 metres (6,600 ft) above sea level. It is fed by the Khuiten River from the east and other rivers from the north. With an area of 50 square kilometres (19 sq mi), it is the country's twenty-sixth largest lake by surface area. It has a maximum depth of 8.58 metres (28.1 ft). The lake is home to abundant fish life.