Middleton Field (ICAO: KGZH, FAA LID: GZH, formerly 39J) is a public-use airport located 5 nautical miles (9.3 km; 5.8 mi) west of the central business district of Evergreen, a city in Conecuh County, Alabama, United States. According to the FAA's National Plan of Integrated Airport Systems for 2009–2013, it is categorized as a general aviation facility. Although the airport is owned by the City of Evergreen, it is primarily used for flight training by the U.S. Navy as Naval Outlying Field Evergreen under Whiting Field.