Pattaya is a city in Eastern Thailand, the second-largest city in Chonburi province and the eighth-largest city in Thailand. It is on the east coast of the Gulf of Thailand, about 100 kilometres (62 mi) southeast of Bangkok, and has a population of 328,961 as of 2021.

Pattaya City (Thai: เมืองพัทยา, RTGS: Mueang Phatthaya, pronounced [mɯ̄a̯ŋ pʰát.tʰā.jāː]) is a special local government organization area within Bang Lamung district and has a population of 119,532. It covers the tambons of Nong Prue and Na Klua and parts of Huai Yai and Nong Pla Lai. Pattaya City has grown into all adjacent sub-districts and accounts for the largest population percentage in the district, making it de facto a part of the "Pattaya-Bang Lamung-Jomtien" area, otherwise known as "Greater Pattaya".

The city is in the industrial Eastern seaboard zone, along with Si Racha, Laem Chabang, and Chonburi. Pattaya is at the center of the Pattaya-Chonburi Metropolitan Area (a conurbation in Chonburi Province with a population of 1,000,000), which forms the third largest metropolitan area in Thailand.

The name Pattaya evolved from the march of Phraya Tak (later King Taksin) and his army from Ayutthaya to Chanthaburi, which took place before the fall of the former capital to Burmese invaders in 1767. When his army arrived in the vicinity of what is now Pattaya, Phraya Tak encountered the troops of a local leader named Nai Klom, who tried to intercept him. When the two met face to face, Nai Klom was impressed by Phraya Tak's dignified manner and his army's strict discipline. He surrendered without a fight and joined his forces.

The place the armies confronted each other was thereafter known as "Thap Phraya", which means the "army of the Phraya". Thap Phraya was later changed to Phatthaya, which means 'the wind blowing from the southwest to the northeast at the beginning of the rainy season'.

Following World War II, entrepreneur Parinya Chawalitthamrong saw the potential of investing in Pattaya and donated some land to the governing administration. Pattaya City Hall would later be constructed on this land.

A fishing village until the 1960s, tourism began during the Vietnam War, when American servicemen began arriving on R&R (rest and relaxation). One large group who arrived from a base in Korat on 29 June 1959 and rented houses from Phraya Sunthorn at the south end of the beach, on what is now known as the "Strip", are credited with recommending Pattaya, whose fame spread by word of mouth.

On 29 November 1978, Pattaya was granted city status by the Thai government. In 1978, it also became a special governed city.