Beijing Nanyuan Airport (IATA: NAY, ICAO: ZBNY) was a People's Liberation Army Air Force Base and a secondary commercial airport of Beijing, the capital of China. Located in Fengtai District, 3 km (1.9 mi) south of the 4th Ring Road and 13 km (8.1 mi) from Tiananmen Square, Nanyuan Airport was first opened in 1910, making it the oldest airport in China. It was the main operating base for China United Airlines, which was also the airport's sole airline.

Nanyuan Airport ceased civil operations on 25 September 2019, after all commercial passenger flights (operated by China United Airlines) were moved to the newly opened Beijing Daxing International Airport. It remained operational as a People's Liberation Army Air Force military base until 30 September 2019, when the Beijing Nanjiao Airport (known as "New Nanyuan Airport" during construction, adjacent to Beijing Daxing Airport) opened.