Eastern Thailand is a region of Thailand bordering Cambodia on the east, Northeastern Thailand in the north, and central Thailand on the west.

Eastern Thailand lies between the Sankamphaeng Range, which forms a natural border with the Khorat Plateau to the north and the Gulf of Thailand to the south. The geography of the region is characterised by short mountain ranges (collectively grouped under the Chanthaburi Range) alternating with small basins of short rivers which drain into the Gulf of Thailand. Between the Chanthaburi and Sankamphaeng mountains lies the basin of the Bang Pakong River system.

Fruit is a major component of agriculture in the area, and tourism plays a strong part in the economy. The region's coastal location has helped promote eastern seaboard industrial development, a major factor in the economy of the region.^[4]

Islands off Eastern Thailand's coast include Ko Sichang, Ko Lan, Ko Samet, and Ko Chang.

According to the six geographical regions established by the National Research Council of Thailand, the eastern region includes seven provinces.

The Thai Meteorological Department (TMD), the Office of the National Economic and Social Development Council (NESDC) ^[5] and Royal Forest Department (RFD) also include province Nakhon Nayok in the Eastern region.

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Flag	Seal		Province	Capital	DOPA	Popul.	Area (km2)	Dens.	ISO
		1	Chonburi	Chonburi	9	1,558,301	4,508	346	TH-20
		2	Rayong	Rayong	50	734,753	3,666	201	TH-21
		3	Chanthaburi	Chanthaburi	7	537,698	6,415	84	TH-22
		4	Trat	Trat	16	229,958	2,866	78	TH-23
		5	Chachoengsao	Chachoengsao	8	720,113	5,169	139	TH-24
		6	Prachin Buri	Prachin Buri	31	494,680	5,026	99	TH-25
		7	Sa Kaeo	Sa Kaeo	63	566,303	6,831	83	TH-27

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Note: Population is based on "Statistics, population and house statistics for the year 2019" from Registration Office Department of the Interior. Reference date is 31 December 2019.^[2]
Area is based on "Thailand boundary from Department of Provincial Administration.^[1]

For fiscal year 2018, Eastern Thailand Region had a combined economic output of 3,026 trillion baht (US$97.6 billion), or 18.5 percent of Thailand's GDP. Rayong province had an economic output of 1.045 trillion baht (US$33.7 billion). This amounted to a per-capita Gross Provincial Product (GPP) value of 1,067,449 baht (US$34,434), almost double the GPP per-capita of the three following provinces in the ranking.^[6]

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The main language of Eastern Thailand is Central Thai language but also regionalism. Krungthep dialect (dominant variant) is spoken among Thai Chinese communities, that is EEC area (such as in Chonburi, Siracha, Pattaya, Padriew, Bangpakong etc.), dialect from Prachinburi Province pretty similar with Ayutthaya dialect (traditional working class dialect in Bangkok), while the Rayong dialect and Chantaburi dialect are pretty similar with Suphanburi dialect (another dialect in Central Thailand).

Isan language are minority status in Eastern Thailand, most are spoken in the eastern part of Prachinburi and upper part of Sa Kaeo Provinces, this is the same variant as the Khonkaen dialect (Standard Lao language). Khmer language in Eastern Thailand is mostly spoken among older generation in Chantaburi and today become endangered language.

• Regions of Thailand
• Eastern Seaboard of Thailand