Chaplin Lake is a salt lake in the south-west corner of the Canadian province of Saskatchewan. The lake is in the Prairie Pothole Region of North America, which extends throughout three Canadian provinces and five U.S. states, and within Palliser's Triangle and the Great Plains ecoregion of Canada. Along the northern shore is the village of Chaplin, Chaplin Nature Centre, and a sodium sulphate mine owned and operated by Saskatchewan Mining and Minerals. The lake is divided into four sections by dykes built by the mining company. The Trans-Canada Highway runs along the northern shore and Highway 58 runs through the middle of the lake in a south to north direction.