Central Thailand is a region of Thailand, covering the broad alluvial plain of the Chao Phraya River. It is separated from North-East Thailand (Isan) by the Phetchabun mountain range, and another mountain range separates it from Myanmar to the west. In the north it gently changes into the more hilly Northern Thailand. The area was the heartland of the Ayutthaya kingdom, and is still the dominant area of Thailand.

Administration

Central Thailand including the eastern provinces is divided into 26 provinces. Especially for statistical purposes these are divided into 4 groups:

• Bangkok and vicinity: Bangkok, Nakhon Pathom, Nonthaburi, Pathum Thani, Samut Prakan, Samut Sakhon
• Sub-central region: Ang Thong, Ayutthaya, Chainat, Lopburi, Saraburi, Singburi
• Western region: Kanchanaburi, Phetchaburi, Prachuap Khiri Khan, Ratchaburi, Samut Songkhram, Suphanburi
• Eastern region: Chachoengsao, Chanthaburi, Chonburi, Nakhon Nayok, Rayong, Prachinburi, Srakaeo, Trat

The eastern region is often listed as a separate region destinct from central Thailand, however then excluding Nakhon Nayok. None of these regions are actually administrative subdivision, they are only geographical or statistical groupings.