Kristi Lynn Arnold Noem (née Arnold; born November 30, 1971) is an American politician serving since 2025 as the 8th United States secretary of homeland security. A member of the Republican Party, she served from 2019 to 2025 as the 33rd governor of South Dakota and from 2011 to 2019 represented South Dakota's at-large congressional district in the U.

S. House of Representatives. Born in Watertown, South Dakota, Noem began her political career in the South Dakota House of Representatives, serving from 2007 to 2011.