1919 Chicago mayoral election

In the Chicago mayoral election of 1919, Republican William H. Thompson won reelection, winning a four way race against Democrat Robert Sweitzer (who had also been his opponent in the previous election), independent candidate Maclay Hoyne, and Cook County Labor Party candidate John Fitzpatrick. Sweitzer was the incumbent Cook County clerk, while Hoyne was the incumbent Cook County state's attorney. Fitzpatrick was a trade unionist.

The two major parties both selected their nominees through primary elections. Sweitzer, who had also been Democratic Party's 1915 nominee, defeated Thomas Carey, the former chair of the Cook County Democratic Party, in the Democratic primary. Thompson won a large margin of the vote in the Republican Party primary over both Harry Olson, who had also been his opponent in the 1915 primary, and 1911 Republican mayoral nominee Charles E. Merriam.