Richard Joseph Daley was an American politician who served as the mayor of Chicago from 1955, and the chairman of the Cook County Democratic Party Central Committee from 1953, until his death. He has been called "the last of the big city bosses" who controlled and mobilized American cities. Daley was Chicago's third consecutive mayor from the working-class, heavily Irish American South Side neighborhood of Bridgeport, where he lived his entire life. He was the patriarch of the Daley family, whose members include Richard M. Daley, another former mayor of Chicago; William M. Daley, a former United States Secretary of Commerce; John P. Daley, a member of the Cook County Board of Commissioners; and Patrick Daley Thompson, a former alderman of the Chicago City Council.

The mayor of Chicago is the chief executive of city government in Chicago, Illinois, the third-largest city in the United States. The mayor is responsible for the administration and management of various city departments, submits proposals and recommendations to the Chicago City Council, is active in the enforcement of the city's ordinances, submits the city's annual budget and appoints city officers, department commissioners or directors, and members of city boards and commissions.