| Official Name: | Nong Saeng |
| Native Name: | หนองแสง |
| 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: | Thap Kung |
| Subdivision Type3: | Tambon |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 25802 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 41340 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4121 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 17.1675°N 102.7806°W |
Nong Saeng (th|หนองแสง, pronounced as /th/) is a district (amphoe) of Udon Thani province, northeastern Thailand.
Neighboring districts are (from the west clockwise) Nong Wua So, Mueang Udon Thani, Kumphawapi, and Non Sa-at of Udon Thani Province, and Khao Suan Kwang of Khon Kaen province.
The area of the district was originally part of Kumphawapi district. It was made a minor district (king amphoe) on 1 January 1981,[1] then consisting of two tambons and 27 villages. The district office was opened in village three of tambon Nong Saeng on 1 January 1983.[2]
The district is divided into four sub-districts (tambons), which are further subdivided into 38 villages (mubans). Saeng Sawang is a township (thesaban tambon) which covers parts of tambon Saeng Sawang. There are a further four tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Nong Saeng | หนองแสง | 8 | 4,461 | ||
| 2. | Saeng Sawang | แสงสว่าง | 8 | 7,157 | ||
| 3. | Na Di | นาดี | 11 | 6,305 | ||
| 4. | Thap Kung | ทับกุง | 11 | 7,879 |