The United States Senate election in Illinois of 1950 was held on November 7, 1950 to elect one of Illinois's members to the United States Senate. Republican Everett Dirksen defeated incumbent Democratic Senator and Senate Majority Leader Scott W. Lucas, who had been seeking a third term.
Dirksen: 40–50% 50-60% 60-70% 70-80%
Lucas: 40–50% 50–60% 60–70%
This was the last time a Senate party leader lost re-election until 2004.
Primaries were held on April 11.
|Democratic||Scott W. Lucas (incumbent)||768,801||100|
|Republican||Everett McKinley Dirksen||545,028||73.46|
|Republican||William J. Baker||149,286||20.12|
Dirksen carried 82 of the state's 102 counties. Among the 88 counties that Dirksen won was the state's most populous county, Cook County, in which Dirksen won with 50.01% to Lucas' 49.60%. Despite losing in Cook County, Lucas performed better in the county than he did in the cumulative vote of the remaining 101 counties, where Dirksen won 57.56% to Lucas' 42.13%. 54.54% of the votes cast in the election were from Cook County.
|Republican||Everett McKinley Dirksen||1,951,984||53.88|
|Democratic||Scott W. Lucas (incumbent)||1,657,630||45.76|
|Prohibition||Enoch A. Holtwick||13,050||0.36|
- "OFFICIAL VOTE of the STATE OF ILLINOIS Cast at the GENERAL ELECTION, November 7, 1950 JUDICIAL ELECTION, 1950, PRIMARY ELECTION General Primary, April 11, 1950" (PDF). Illinois State Board of Elections. Retrieved 9 July 2020.[permanent dead link]