Dirk Arthur Kempthorne (born October 29, 1951) is an American politician who was the United States Secretary of the Interior from 2006 to 2009, serving under President George W. Bush. A Republican, Kempthorne previously served as a United States Senator from Idaho from 1993 to 1999 and as the 30th Governor of Idaho from 1999 to 2006. He is known for his conservative views, particularly on economic issues.
Kempthorne was first elected to public office as mayor of Boise in 1985, where he served for seven years.
Kempthorne serves as a co-chair of the Democracy Project at the Bipartisan Policy Center. In November 2010, he was appointed president and CEO of the American Council of Life Insurers.