Krasiao Dam (Thai: เขื่อนกระเสียว, RTGS: Khuean Krasiao, pronounced [kʰɯ̀a̯n krā.sǐa̯w]) is in Huai Khamin Subdistrict, Dan Chang District, Suphan Buri Province, Thailand.
It is an earthen dam built to store water from the Krasiao River.
Its reservoir is 28,750 rai (46.00 km2; 17.76 sq mi).
The capacity of the dam is 240 million metres3.
It is the longest earthen dam in Thailand.