| Official Name: | Santi Suk |
| Native Name: | สันติสุข |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Nan |
| Established Title: | District established |
| Population Total: | 15695 |
| Population As Of: | 2009 |
| Population Density Km2: | auto |
| Leader Title: | Marshal |
| Leader Name: | Pitsanu Sawangsap |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 55000 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 5511 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 18.9133°N 100.9414°W |
Santi Suk (Thai: สันติสุข, in Thai pronounced as /sǎn.tì(ʔ) sùk/; สันติ๋สุ๋ข, pronounced as /sǎn.tǐ(ʔ) sǔk/) is a district (amphoe) in the central part of Nan province, northern Thailand.
The minor district (king amphoe) Santi Suk was established on 15 June 1981, when the two tambons Du Phong and Pa Laeo Luang were split off from Mueang Nan district.[1] [2] The third tambon, Phong, was assigned from Mae Charim district on 21 April 1983.[3] The minor district was upgraded to a full district on 4 July 1994.[4]
Neighboring districts are, from the north clockwise, Tha Wang Pha, Pua, Bo Kluea, Mae Charim, Phu Phiang and Mueang Nan.
The eastern part of the district is in the Luang Prabang Range mountain area of the Thai highlands.[5]
The district is divided into three sub-districts (tambons), which are further subdivided into 31 villages (mubans). There are no municipal (thesaban) areas, and three tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Du Phong | ดู่พงษ์ | 8 | 5,022 | ||
| 2. | Pa Laeo Luang | ป่าแลวหลวง | 10 | 4,513 | ||
| 3. | Phong | พงษ์ | 13 | 6,154 |