The 8th congressional district of Illinois is a congressional district in the U.S. state of Illinois that has been represented by Democrat Raja Krishnamoorthi since 2017.

Subramanian Raja Krishnamoorthi is an American businessman, politician, and attorney serving as the U.S. representative for Illinois's 8th congressional district since 2017. The district includes many of Chicago's western and northwestern suburbs, such as Hoffman Estates, Elgin, Schaumburg, Wood Dale, and Elk Grove Village. A member of the Democratic Party, Krishnamoorthi serves as the Ranking Member of the House Select Committee on Strategic Competition between the United States and the Chinese Communist Party, the House Committee on Oversight and Accountability, and the House Permanent Select Committee on Intelligence.