| Official Name: | Nong Muang Khai |
| Native Name: | หนองม่วงไข่ |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Phrae |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Nong Muang Khai |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 19302 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 54170 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 5408 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 18.2647°N 100.19°W |
Nong Muang Khai (Thai: หนองม่วงไข่, in Thai pronounced as /nɔ̌ːŋ mûa̯ŋ kʰàj/) is a district (amphoe) in the central part of Phrae province, northern Thailand.
The minor district (king amphoe) Nong Muang Khai was established on 1 April 1990 from tambons Mae Kham Mi and Nong Muang Khai of Rong Kwang district and Wang Luang and Nam Rat of Song district. It was made a subordinate of Rong Kwang District.[1] It was upgraded to a full district on 7 September 1995.[2]
Neighboring districts are (from the north clockwise): Song, Rong Kwang, Mueang Phrae, and Long.
The district is divided into six sub-districts (tambons), which are further subdivided into 34 villages (mubans). Nong Muang Khai is a township (thesaban tambon) and covers most parts of tambon Nong Muang Khai. There are a further five tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Mae Kham Mi | แม่คำมี | 4 | 2,262 | ||
| 2. | Nong Muang Khai | หนองม่วงไข่ | 8 | 4,853 | ||
| 3. | Nam Rat | น้ำรัด | 6 | 3,594 | ||
| 4. | Wang Luang | วังหลวง | 5 | 2,716 | ||
| 5. | Tamnak Tham | ตำหนักธรรม | 7 | 3,549 | ||
| 6. | Thung Khaeo | ทุ่งแค้ว | 4 | 2,328 |