Nong Ya Sai district
Nong Ya Sai 
    หนองหญ้าไซ  | |
|---|---|
District location in Suphan Buri province  | |
| Coordinates: 14°46′30″N 99°54′40″E / 14.77500°N 99.91111°E | |
| Country | Thailand | 
| Province | Suphan Buri | 
| Seat | Nong Ya Sai | 
| Area | |
 • Total  | 420.2 km2 (162.2 sq mi) | 
| Population  (2013)  | |
 • Total  | 49,272 | 
| • Density | 118.7/km2 (307/sq mi) | 
| Time zone | UTC+7 (ICT) | 
| Postal code | 72240 | 
| Geocode | 7210 | 
Nong Ya Sai (Thai: หนองหญ้าไซ, pronounced [nɔ̌ːŋ jâː sāj]) is a district (amphoe) in the western part of Suphan Buri province, central Thailand.