Kristi Lynn Arnold Noem (born November 30, 1971) is an American politician who has served since 2019 as the 33rd governor of South Dakota. A member of the Republican Party, she was the U.S. representative for South Dakota’s at-large congressional district from 2011 to 2019 and a member of the South Dakota House of Representatives for the 6th district from 2007 to 2011.

In November 2024, Donald Trump nominated Noem to serve as Homeland Security Secretary.