South Dakota's at-large congressional district is the sole congressional district for the state of South Dakota. Based on area, it is the fourth largest congressional district in the nation.

Dustin Michael Johnson is an American politician serving as the U.S. representative for South Dakota's at-large congressional district since 2019. A member of the Republican Party, he served as South Dakota Public Utilities Commissioner from 2005 to 2011, when he was appointed chief of staff to Governor Dennis Daugaard, a position he held until 2014. Between his state political career and congressional service, Johnson was the vice president of Vantage Point Solutions in Mitchell, South Dakota.