| Official Name: | Nong Wua So |
| Native Name: | หนองวัวซอ |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Udon Thani |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Non Wai |
| Subdivision Type3: | Tambon |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 61658 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 41220 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4103 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 17.1625°N 102.5728°W |
Nong Wua So (Thai: หนองวัวซอ, in Thai pronounced as /nɔ̌ːŋ wūa sɔ̄ː/; หนองงัวซอ, in Lao pronounced as /nɔ̌ːŋ ŋu᷇a sɔ᷇ː/) is a district (amphoe) in the western part of Udon Thani province, northeastern Thailand.
Neighboring districts are (from the north clockwise) Kut Chap, Mueang Udon Thani, and Nong Saeng of Udon Thani Province, Khao Suan Kwang of Khon Kaen province and Non Sang and Mueang Nongbua Lamphu of Nong Bua Lamphu province.
The district was established as a minor district (king amphoe) on 16 April 1971, when it was split off from Mueang Udon Thani district.[1] It was upgraded to a full district on 1 April 1974.[2]
The district is divided into eight sub-districts (tambons), which are further subdivided into 78 villages (mubans). There are two townships (thesaban tambon). Nong Wua So covers parts of tambons Nong Wua So and Mak Ya; and Nong O Non Wai covers parts of tambons Nong O and Non Wai. There are a further seven tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Mak Ya | หมากหญ้า | 12 | 8,077 | ||
| 2. | Nong O | หนองอ้อ | 11 | 9,055 | ||
| 3. | Up Mung | อูบมุง | 10 | 8,435 | ||
| 4. | Kut Mak Fai | กุดหมากไฟ | 11 | 7,984 | ||
| 5. | Nam Phon | น้ำพ่น | 8 | 6,789 | ||
| 6. | Nong Bua Ban | หนองบัวบาน | 9 | 6,077 | ||
| 7. | Non Wai | โนนหวาย | 9 | 7,738 | ||
| 8. | Nong Wua So | หนองวัวซอ | 8 | 7,503 |