Wittman Regional Airport (IATA: OSH, ICAO: KOSH, FAA LID: OSH) is a county-owned public-use airport located two nautical miles (4 km) south of the central business district of Oshkosh, a city in Winnebago County, Wisconsin, United States. A large portion at the south end of the airport is located in the town of Nekimi. It is located adjacent to Pioneer Airport, part of the EAA Aviation Museum. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2023–2027, in which it is categorized as a regional general aviation facility.