The 1974 United States Senate election in Illinois took place on November 5, 1974. Incumbent Democratic U.S. Senator Adlai Stevenson III, who was first elected in a special election in 1970, was re-elected to a full term in office, defeating Republican George Burditt by a landslide margin of 62% to 37%.
The primaries (held March 19) and general elections coincided with those for House and those for state offices.
Turnout in the primary elections was 24.88%, with a total of 1,502,852 votes cast. Turnout during the general election was 49.35%, with 2,914,666 votes cast.