U-Tapao Rayong International Airport (IATA: UTP, ICAO: VTBU) (Thai: ท่าอากาศยานนานาชาติอู่ตะเภา), also spelled Utapao and U-Taphao, is a joint civil-military public airport serving Rayong and Pattaya, cities in Thailand. It is approximately 90 miles (140 km) southeast of Bangkok, near Sattahip on the Gulf of Siam. It is located south of route 3 (Thanon Sukhumvit) at km 189, about a 45 minute drive from Pattaya (Thailand's most popular beach resort).

It also serves as the U-Tapao Royal Thai Navy Airfield, home of the Royal Thai Navy First Air Wing. U-Tapao is the home of a large Thai Airways maintenance facility, servicing that airline's aircraft as well as those of other customers. Due to the blockade of Bangkok's airports by opposition protesters, U-Tapao briefly became the main air gateway to Thailand between November 26 and December 5, 2008.