| Official Name: | Omkoi |
| Native Name: | อมก๋อย |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Chiang Mai |
| Subdivision Type2: | Seat |
| Subdivision Type3: | Tambon |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 54568 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 50310 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 5018 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 17.8011°N 98.3586°W |
Omkoi (Thai: อมก๋อย, in Thai pronounced as /ʔōm.kɔ̌j/) is the southwesternmost district (amphoe) of Chiang Mai province in northern Thailand.
Neighboring districts are (from the north clockwise) Hot and Doi Tao of Chiang Mai Province, Sam Ngao, Mae Ramat, and Tha Song Yang of Tak province and Sop Moei of Mae Hong Son province. The Thanon Thongchai Range dominates the landscape.
The minor district (king amphoe) was established on 19 April 1929 as a subordinate of Hot district, consisting of the three sub-districts Omkoi, Yang Piang, and Mae Tuen.[1] It was upgraded to a full district on 23 July 1958.[2]
The district is divided into six sub-districts (tambon), which are further subdivided into 95 villages (muban). Omkoi is a sub-district municipality (thesaban tambon) which covers parts of the tambon Omkoi. There are further six tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Omkoi | อมก๋อย | 20 | 17,208 | ||
| 2. | Yang Piang | ยางเปียง | 17 | 7,990 | ||
| 3. | Mae Tuen | แม่ตื่น | 16 | 9,180 | ||
| 4. | Mon Chong | ม่อนจอง | 9 | 6,008 | ||
| 5. | Mae Long[3] | แม่หลอง | 12 | 6,285 | ||
| 6. | Na Kian | นาเกียน | 21 | 7,897 |