| Official Name: | Watthana Nakhon |
| Native Name: | วัฒนานคร |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Sa Kaeo |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Watthana Nakhon |
| Established Title: | District established |
| Population Total: | 79856 |
| Population As Of: | 2008 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 27160 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 2705 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 13.7478°N 102.3075°W |
Watthana Nakhon (in Thai pronounced as /wát.tʰā.nāː ná(ʔ).kʰɔ̄ːn/) is a district (amphoe) in the central part of Sa Kaeo province, eastern Thailand.
Watthana Nakhon is an ancient city. Established before 1917 and originally named Watthana, it was a minor district (king amphoe) in the Aranyaprathet district, until it was upgraded to a full district on 6 June 1956.[1]
Neighboring districts are (from the east clockwise) Ta Phraya, Khok Sung, Aranyaprathet, Khlong Hat, Wang Nam Yen, Khao Chakan, Mueang Sa Kaeo of Sa Kaeo Province, Khon Buri, Soeng Sang of Nakhon Ratchasima province and Non Din Daeng of Buriram province. The Sankamphaeng Range mountainous area is in the northern section of this district.
The district is divided into 11 sub-districts (tambons), which are further subdivided into 115 villages (mubans). Watthana Nakhon is a sub-district municipality (thesaban tambon) and covers parts of tambon Watthana Nakhon. There are a further 11 tambon administrative organizations (TAO).
| No. | Name | Thai | Villages | Pop.[2] | |
|---|---|---|---|---|---|
| 1. | Watthana Nakhon | วัฒนานคร | 14 | 13,503 | |
| 2. | Tha Kwian | ท่าเกวียน | 14 | 10,224 | |
| 3. | Phak Kha | ผักขะ | 13 | 5,401 | |
| 4. | Non Mak Kheng | โนนหมากเค็ง | 9 | 5,289 | |
| 5. | Nong Nam Sai | หนองน้ำใส | 9 | 6,584 | |
| 6. | Chong Kum | ช่องกุ่ม | 9 | 5,787 | |
| 7. | Nong Waeng | หนองแวง | 7 | 3,831 | |
| 8. | Sae-o | แซร์ออ | 14 | 10,760 | |
| 9. | Nong Mak Fai | หนองหมากฝ้าย | 8 | 5,934 | |
| 10. | Nong Takhian Bon | หนองตะเคียนบอน | 10 | 6,477 | |
| 11. | Huai Chot | ห้วยโจด | 6 | 6,066 |