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. The airport was named after pioneer air racer and aircraft designer and builder Steve Wittman in 1972. Originally named Winnebago County Airport, it is also known as Wittman Field.