2004 United States House of Representatives elections in Illinois

The 2004 congressional elections in Illinois were held November 2, 2004 to determine who would represent the State of Illinois in the United States House of Representatives.

Illinois had nineteen seats in the House, apportioned according to the 2000 United States census. Representatives are elected for two-year terms; those elected would serve in the 109th Congress from January 3, 2005, to January 3, 2007.