Hardwick Field (ICAO: KHDI, FAA LID: HDI), also known as Cleveland Municipal Airport, was a public airport located four miles (6 km) northeast of the central business district of Cleveland, in Bradley County, Tennessee, United States. It opened in 1955 and was owned by the City of Cleveland. Although most U.S. airports used the same three-letter location identifier for the FAA and IATA, Hardwick Field was assigned HDI by the FAA but had no designation from the IATA.