United States House of Representatives elections in Missouri, 2012

The 2012 United States House of Representatives elections in Missouri were held on Tuesday, November 6, 2012 and elected the eight U.S. Representatives from the state of Missouri, a loss of one seat following the 2010 United States Census. The elections coincided with the elections of other federal and state offices, including a quadrennial presidential election and an election to the U.S. Senate.

A new congressional map was passed by the Missouri General Assembly on April 27, 2011. The map was vetoed by Democratic Governor Jay Nixon on April 30, but Nixon's veto was overridden by the General Assembly on May 4, making the plan law. The map effectively eradicates the former 3rd district, which has been represented by Democrat Russ Carnahan since 2005, splitting it between the districts represented by Republicans Blaine Luetkemeyer and Todd Akin and Democrat William Lacy Clay, Jr.

Democrat William Lacy Clay, Jr., who has represented Missouri's 1st congressional district since 2001, will run for re-election. Fellow U.S. Representative Russ Carnahan, part of whose current district was drawn into the 1st district, challenged Clay in the Democratic primary on August 7, 2012 and lost heavily.Francis Slay, the mayor of St. Louis, did not run and has endorsed Clay. Robyn Hamlin (R), ran against W. Lacy Clay, Jr. in 2010 and is running again for the seat in 2012.

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