Chicago Midway International Airport (IATA: MDW, ICAO: KMDW, FAA LID: MDW) is a major commercial airport on the Southwest side of Chicago, Illinois, located approximately 12 miles (19 km) from the city's Loop business district. Established in 1927, Midway served as Chicago's primary airport until the opening of O'Hare International Airport in 1944. Today, Midway is one of the busiest airports in the nation and the second-busiest airport both in the Chicago metropolitan area and the state of Illinois, serving 22,050,489 passengers in 2023.

Midway is a base for Southwest Airlines, which carries over 95% of the passengers at the airport. The airport's current name is in honor of the Battle of Midway. The now-defunct Midway Airlines, once headquartered at Midway, took its name from the airport. The airfield is located in a square mile bounded by 55th and 63rd streets, and Central and Cicero avenues. The current terminal complex was completed in 2001. The terminal bridges Cicero Avenue and contains 43 gates with facilities for international passengers. The CTA rapid transit Orange Line provides transit to Downtown Chicago, where it connects with other subway/elevated rapid transit lines.