The United States Attorney for the District of South Dakota is responsible for representing the federal government in the United States District Court for the District of South Dakota. By statute, the U.S. attorney is responsible for prosecuting both federal crimes and all serious crimes committed by adults in the District of South Dakota. Therefore, the U.S. attorney for the South Dakota serves as both the federal prosecutor and as the local district attorney. As of October 14, 2025 the United States attorney is Ron A. Parsons Jr..