Hot Springs is a city in and county seat of Fall River County, South Dakota, United States. As of the 2020 census, the city population was 3,395. In addition, neighboring Oglala Lakota County contracts the duties of Auditor, Treasurer and Register of Deeds to the Fall River County authority in Hot Springs.

Fall River County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 6,973. Its county seat is Hot Springs. The county was founded in 1883. It is named for Fall River which runs through it.