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The proposed Chicago south suburban airport (also referred to as the Peotone airport) is a proposed airport that would be located in Peotone, Illinois, United States, approximately 40 miles (64 km) south of Chicago. Serving in addition to the two international commercial airports serving Chicago (O'Hare and Midway), the site would serve the south suburbs of the Chicago metropolitan area. The two existing airports currently serving Chicago (O'Hare and Midway) are located within and operated by the City of Chicago, with the Northern Illinois region also served by two other international airports in Illinois and Wisconsin.
Following the expansion of O'Hare to become one of the busiest international airports in the world, proposals for a third airport have been in discussion since the end of the 1960s, with planning for the development of a site in Peotone since the late 1990s. Since its initiation over 50 years ago, a proposal for a third airport has remained controversial in terms of both cost, need, and calls for alternatives to accommodate increased air traffic demand.