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.

The airport was named after pioneer air racer, aircraft designer and builder Steve Wittman in 1972. Originally named Winnebago County Airport, the name Steve Wittman Field was proposed in 1968, and it is also known as Wittman Field.

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.