Nakhon Chai Si (Thai: นครชัยศรี, pronounced [ná(ʔ).kʰɔ̄ːn t͡ɕʰāj sǐː]) is a district (amphoe) of Nakhon Pathom province, central Thailand.

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Nakhon Chai Si นครชัยศรี
District
The Tha Chin River flowing through Nakhon Chai Si Sub-district where it is called the "Nakhon Chai Si River".
District location in Nakhon Pathom province
Nakhon Chai Si Location in Thailand
Coordinates: 13°48′4″N 100°11′16″E
Country	Thailand
Province	Nakhon Pathom
Seat	Nakhon Chai Si
Area
• Total	284.031 km2 (109.665 sq mi)
Population  (2017)
• Total	111,119
• Density	391.22/km2 (1,013.3/sq mi)
Time zone	UTC+7 (ICT)
Postal code	73120
Geocode	7303

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It was established in the reign of King Maha Chakkraphat of Ayutthaya kingdom. When King Chulalongkorn created the Monthon as part of the Thesaphiban administrative reform, Mueang Nakhon Chai Si was the capital city of Monthon Nakhon Chai Si. Later when the government gave up the system, Mueang Nakhon Chai Si was downgraded to be a district of Nakhon Pathom.

More than 1,000 years ago, Han Chinese called Nakhon Chai Si (including other districts in this region, such as Samut Sakhon) according Teochew dialect that Leng-Kia-Su (Chinese: 龍仔厝; pinyin: Lóng zǐ cuò), refers to 'home of dragon descendants'. Because the Tha Chin River flows through the winding like a serpent or dragon.^[1]

Neighboring districts are (from the north clockwise): Bang Len, Phutthamonthon, Sam Phran, Mueang Nakhon Pathom, and Don Tum.

The main water resource is the Tha Chin River, which is named Nakhon Chai Si River in the area of and around the district.

In mid-2019, the Department of Airports (DOA) proposed the construction of a new airport in Nakhon Pathom province, 50 kilometres west of Bangkok, to relieve pressure on Bangkok's two existing airports. The 20 billion baht airport would occupy 3,500 rai of land in Nakhon Chai Si District as well as Bang Len. Its capacity would be 25 million passengers annually. If approved, construction would start in 2023 and the airport would be operational by 2025 or 2026.^[2]

The district is divided into 24 sub-districts (tambons), which are further subdivided into 108 villages (mubans). Both Nakhon Chai Si and Huai Phlu have sub-district municipality (thesaban tambon) status. Each of the tambons has a tambon administrative organization (TAO).