Michael Keith Simpson is an American politician and former dentist serving as the U.S. representative for Idaho's 2nd congressional district since 1999. The district covers most of the eastern portion of the state, including Idaho Falls, Pocatello, Sun Valley, Twin Falls and the northern two-thirds of Boise. A member of the Republican Party, Simpson was first elected to public office in 1984, and was elected to the House in the 1998 elections, succeeding Mike Crapo. He served as Speaker of the Idaho House of Representatives from 1992 to 1998.

Idaho's 2nd congressional district is one of two congressional districts in the U.S. state of Idaho, in the eastern portion of the state. Beginning with the 2012 election, the district expanded westward and now includes most of Boise, the state capital and largest city. The district is currently represented by Mike Simpson, a Republican of Idaho Falls. A former dentist in Blackfoot, he was first elected in 1998; the seat opened when his predecessor Mike Crapo successfully ran for the U.S. Senate.