Hua Sai district
Hua Sai 
    หัวไทร  | |
|---|---|
District location in Nakhon Si Thammarat province  | |
| Coordinates: 8°2′24″N 100°16′30″E / 8.04000°N 100.27500°E | |
| Country | Thailand | 
| Province | Nakhon Si Thammarat | 
| Seat | Hua Sai | 
| Area | |
 • Total  | 417.733 km2 (161.288 sq mi) | 
| Population  (2005)  | |
 • Total  | 68,863 | 
| • Density | 164.8/km2 (427/sq mi) | 
| Time zone | UTC+7 (ICT) | 
| Postal code | 80170 | 
| Geocode | 8016 | 
Hua Sai (Thai: หัวไทร, pronounced [hǔa̯ sāj]) is a district (amphoe) in the southeastern part of Nakhon Si Thammarat province, southern Thailand.