Prachuap Khiri Khan is a town in western Thailand. It is the capital of Prachuap Khiri Khan Province and is on the coast at one of the narrowest stretches in Thailand, only 10 kilometres (6.2 mi) from the border with Myanmar at Dan Sing Khon in the Tenasserim Hills. The area has large pineapple and coconut industries, in addition to being popular with Thai tourists. The town is 291 km south of Bangkok by road.

Prachuap Khiri Khan is one of the western provinces (changwat) of Thailand. It is in the northern part of the Malay Peninsula, some 240 km (149 mi) south of Bangkok. Neighboring provinces include Phetchaburi to the north and Chumphon to the south. To the west, it borders Tanintharyi Region of Myanmar.