| Official Name: | Phon Sai |
| Native Name: | โพนทราย |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Roi Et |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Phon Sai |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 27420 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 45240 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4513 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 15.4878°N 103.9964°W |
Phon Sai (Thai: โพนทราย, in Thai pronounced as /pʰōːn sāːj/) is a district (amphoe) in the southeastern part of Roi Et province, northeastern Thailand.
Neighboring districts are (from the west clockwise): Suwannaphum and Nong Hi of Roi Et Province; Sila Lat and Rasi Salai of Sisaket province; and Rattanaburi of Surin province.
The minor district (king amphoe) Phon Sai was established on 16 November 1976, when the two tambons, Phon Sai and Samkha, were split off from Suwannaphum district.[1] It was upgraded to a full district on 25 May 1989.[2]
The district is divided into five sub-districts (tambons), which are further subdivided into 58 villages (mubans). Phon Sai is a township (thesaban tambon) which covers parts of tambon Phon Sai. There are a further four tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Phon Sai | โพนทราย | 14 | 6,385 | ||
| 2. | Samkha | สามขา | 9 | 4,477 | ||
| 3. | Si Sawang | ศรีสว่าง | 15 | 7,448 | ||
| 4. | Yang Kham | ยางคำ | 10 | 4,403 | ||
| 5. | Tha Hat Yao | ท่าหาดยาว | 10 | 4,707 |