Lac des Vaux is a lake above La Tzoumaz and Verbier in the canton of Valais, Switzerland.

The lake is located in the municipality of Riddes-La Tzoumaz.

Owing to its high altitude and its main source coming from melted snow, the lake remains cold throughout most of the year.

July and August is when the lake reaches its warmest temperature of about 10 °C to 12 °C, this is when most people swim.

Swimming is still possible until early October, however, a wet suit is recommended as the water temperature is only about 5 °C.