Jane Margaret Byrne was an American politician who served as the 50th mayor of Chicago from April 16, 1979, until April 29, 1983. Prior to her tenure as mayor, Byrne served as Chicago's commissioner of consumer sales from 1969 until 1977, the only female in the mayoral cabinet.

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.