| Krasiao Dam | |
| Coordinates: | 14.8325°N 99.6614°W |
| Country: | Thailand |
| Location: | Huai Khamin Subdistrict, Dan Chang District, Suphan Buri Province |
| Purpose: | Irrigation, flood control |
| Status: | Operational |
| Construction Began: | 1966 |
| Opening: | 1981 |
| Cost: | 960 million baht |
| Builder: | Royal Irrigation Department (RID) |
| Owner: | RID |
| Dam Type: | Earthen |
| Dam Height Foundation: | 32.5 m |
| Dam Length: | 4,250 m |
| Res Capacity Total: | 390 m3 |
| Res Capacity Active: | 240 m3 |
| Res Catchment: | 1,220 km2 |
Krasiao Dam (Thai: เขื่อนกระเสียว,, in Thai pronounced as /kʰɯ̀a̯n krā.sǐa̯w/) is in Huai Khamin Subdistrict, Dan Chang District, Suphan Buri Province, Thailand.[1] It was built in 1980. It is an earthen dam built to store water from the Krasiao River. Its length is 4,250 meters and its height is 32.5 meters. Its reservoir is 28750rai. The capacity of the dam is 240 million metres3. It is the longest earthen dam in Thailand. Its beneficial area is 350,000 rai.