Beijing Capital International Airport (pinyin: Beijing Shoudu Guójì Jicháng) (IATA: PEK, ICAO: ZBAA) is the main international airport that serves the capital city of Beijing, People's Republic of China. The IATA Airport Code is PEK, reflecting Beijing's former Romanization Peking. The code BJS is also frequently used, reflecting the current pinyin spelling of Beijing and including all airports in the Beijing metropolitan area; currently, Beijing Capital (PEK) is the only civil aviation airport that falls under BJS. Entering either code will get a passenger to the same airport.

Beijing Capital International Airport is today the busiest airport in the People's Republic of China, having registered double-digit growth annually since the SARS crisis of 2003. In 2004, it became the busiest airport in Asia by aircraft movements, overtaking Tokyo International Airport (Haneda). In terms of passengers, Beijing was the second-busiest airport in Asia and fourteenth-busiest worldwide in 2005. In the period from January to September 2005, the airport handled a total of 30,143,003 passengers, overtaking Hong Kong to become the busiest airport in the People's Republic of China for the first time since 1997.