De Smet (also spelled Desmet) is an unincorporated census-designated place in the northwestern United States, located on the Coeur d'Alene Reservation in Benewah County, Idaho.
U.S. Route 95 passes nearby and the community is located about a mile (1.6 km) south of Tensed, which was originally Temsed (De Smet spelled backwards). De Smet has a post office with a ZIP code of 83824. As of the 2010 census, its population was 175, and its elevation is approximately 2,600 feet (790 m) above sea level.
It was named for the Belgian Catholic priest Pierre De Smet, a 19th-century Jesuit missionary. He worked with the Coeur d'Alène and other native peoples of western North America for most of his life, periodically returning to his chapter based in St. Louis, Missouri.