Detroit Metropolitan Wayne County Airport (IATA: DTW , ICAO: KDTW ), sometimes called Detroit Metropolitan Airport , Detroit Metro Wayne Airport , Metro Airport , or simply DTW , is a major international airport in Romulus, Michigan, a suburb of Detroit and it is Michigan's busiest airport.

Detroit the largest hub of Northwest Airlines, who is the airport's principal tenant. It is also the second-largest base for Spirit Airlines, which is the second-largest carrier at the airport. Operated by the Wayne County Airport Authority, the airport is one of the nation's most recently expanded and modernized airports, with six major runways, two terminals, 145 in-service gates, and an attached Westin Hotel and conference center. The airport's McNamara Terminal Concourse A is the world's second-longest airport terminal building at one mile (1.6 km) (just barely beaten by the 1.06-mile long Kansai International Airport). It has maintenance facilities capable of servicing and repairing aircraft as large as the Boeing 747.

In 2007, Detroit Metropolitan Wayne County Airport was the ninth-busiest airport in the United States and the nineteenth busiest airport in the world. Metro Airport also serves the Toledo, Ohio, area, which is located approximately 47 miles (76 km) south of the airport, and the city of Windsor, Ontario in nearby Canada.

Detroit Metro Airport will be the first U.S. airport to see regular service by the new Boeing 787 Dreamliner when it enters service, as Northwest Airlines remains the U.S. launch customer for this new aircraft. Both hub carrier Northwest Airlines and Chinese carrier China Southern Airlines plan to serve the airport with the new aircraft. The airport has access to over 160 destinations in Canada, the USA, Mexico, the Caribbean, Europe, the Middle East, and Asia.