2010 United States House of Representatives elections in Illinois

Elections were held on November 2, 2010, to determine Illinois's 19 members of the United States House of Representatives. Representatives were elected for two-year terms to serve in the 112th United States Congress from January 3, 2011, until January 3, 2013. Primary elections were held on February 2, 2010.

Of the 19 elections, the 10th, 11th, 14th and 17th districts were rated as competitive by ''CQ Politics'' and ''The Rothenberg Political Report''; while the 8th, 10th, 11th, 14th and 17th districts were rated as competitive by ''The Cook Political Report'' and ''Sabato's Crystal Ball''. Of Illinois's nineteen U.S. Representatives, fourteen were re-elected. Republican Mark Kirk of the 10th district did not seek re-election in order to run for the U.S. Senate, while Democrats Melissa Bean of the 8th district, Debbie Halvorson of the 11th district, Bill Foster of the 14th district and Phil Hare of the 17th district were defeated in the general election. Joe Walsh, Adam Kinzinger, Randy Hultgren, and Bobby Schilling were all elected to fill those Democratic-held seats. Bob Dold won Kirk's old seat.

In total, eleven Republicans and eight Democrats were elected. A total of 3,696,159 votes were cast, of which 1,876,316 (51 percent) were for Democratic candidates, 1,720,016 (47 percent) were for Republican candidates, 95,348 (3 percent) were for Green Party candidates, 4,428 (0.1 percent) were for independent candidates and 51 (0.001 percent) were for write-in candidates. As of 2021, this is the last time Republicans won a majority of congressional districts from Illinois.

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