| Official Name: | Wiang Chai |
| Native Name: | เวียงชัย |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Chiang Rai |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Wiang Chai |
| Subdivision Type3: | Subdistricts |
| Subdivision Name3: | 5 |
| Subdivision Type4: | Mubans |
| Subdivision Name4: | 75 |
| Established Title: | Districtestablished |
| Established Date: | 17 June 1974 |
| Population Total: | 43968 |
| Population As Of: | 2008 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 57210 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 5702 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 19.8831°N 99.9331°W |
Wiang Chai (Thai: เวียงชัย; in Thai pronounced as /wīaŋ tɕʰāj/) is a district (amphoe) in the central part of Chiang Rai province, northern Thailand.
Neighboring districts are (from the west clockwise): Mueang Chiang Rai, Wiang Chiang Rung, Phaya Mengrai, and Thoeng of Chiang Rai Province.
The important water resource is the Kok River.
The minor district (king amphoe) was created on 17 June 1974, when the three tambons Wiang Chai, Thung Ko, and Pha Ngam were split off from Mueang Chiang Rai district.[1] It was upgraded to a full district on 25 March 1979.[2]
The district is divided into five sub-districts (tambons), which are further subdivided into 75 villages (mubans). The township (thesaban tambon) Wiang Chai covers parts of tambons Wiang Chai and Mueang Chum. There are a further five tambon administrative organizations (TAO).
| No. | Name | Thai | Villages | Pop.[3] | |
|---|---|---|---|---|---|
| 2. | Wiang Chai | เวียงชัย | 20 | 11,117 | |
| 3. | Pha Ngam | ผางาม | 15 | 9,083 | |
| 4. | Wiang Nuea | เวียงเหนือ | 12 | 6,574 | |
| 6. | Don Sila | ดอนศิลา | 17 | 9,920 | |
| 8. | Mueang Chum | เมืองชุม | 11 | 7,274 |