Winner is a city in central Tripp County, South Dakota, United States. The population was 2,921 at the 2020 census. It is the county seat of Tripp County. Winner also serves as the administrative center of neighboring Todd County, which does not have its own county seat. The nearest airport is Winner Regional Airport.

Tripp County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 5,624. Its county seat is Winner. The county was created in 1873, and was organized in 1909. It is named for lawyer, judge, and diplomat Bartlett Tripp.