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The 2004 United States Senate election in Illinois was held on November 2, 2004. Incumbent Republican Senator Peter Fitzgerald decided to retire after one term. The Democratic and Republican primary elections were held in March, which included a total of 15 candidates who combined to spend a record total of over $60 million seeking the open seat.
On March 16, 2004, State Senator and future President Barack Obama won the Democratic primary, and businessman Jack Ryan won the Republican primary. Three months later, Ryan announced his withdrawal from the race four days after the Chicago Tribune persuaded a California court to release records from Ryan's custody case, which included allegations that Ryan had pressured his then-wife, actress Jeri Ryan, to perform sexual acts in public.