Surat Thani is a city in Amphoe Mueang Surat Thani, Surat Thani Province, southern Thailand. It is the capital of the province Surat Thani. The city has a population of 128,179 (2009), and an area of 68.97 square kilometers. The city's population density is 1,858.47 inhabitants per km². Suran Thani is near the mouth of the river Tapi on the Gulf of Thailand.
The city offers no major tourist attractions in itself, and is thus mainly known to tourists as a transfer to the nearby popular Ko Samui island. It forms the regional commercial center, with a seaport dealing in the main products of the province, rubber and coconuts.