| Official Name: | Nong Bua |
| Native Name: | หนองบัว |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Nakhon Sawan |
| Subdivision Type2: | Tambon |
| Subdivision Type3: | Muban |
| Seat Type: | Seat |
| Established Title: | District established |
| Population Total: | 70609 |
| Population As Of: | 2005 |
| Population Density Km2: | auto |
| Area Total Km2: | 819.5 |
| Postal Code Type: | Postal code |
| Postal Code: | 60110 |
| Blank Name Sec1: | Geocode |
| Blank Info Sec1: | 6004 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 15.865°N 100.5861°W |
Nong Bua (in Thai pronounced as /nɔ̌ːŋ būa̯/) is a district (amphoe) in the northeastern part of Nakhon Sawan province, central Thailand.
The government separated some tambons of Chum Saeng district, Tha Tako district, and Bang Mun Nak district of Phichit province to create the minor district (king amphoe) Nong Bua on 1 January 1948. It was upgraded to a full district on 6 June 1956.
Neighboring districts are (from the north clockwise): Bang Mun Nak and Dong Charoen of Phichit province; Chon Daen and Bueng Sam Phan of Phetchabun province; and Phaisali, Tha Tako, and Chum Saeng of Nakhon Sawan Province.
The district is divided into nine sub-districts (tambons), which are further subdivided into 105 villages (mubans). Nong Bua is a township (thesaban tambon) covering parts of tambons Nong Bua and Nong Klap. There are a further nine tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | |
|---|---|---|---|---|---|
| 1. | Nong Bua | หนองบัว | 20 | 15,342 | |
| 2. | Nong Klap | หนองกลับ | 15 | 13,103 | |
| 3. | Than Thahan | ธารทหาร | 9 | 7,977 | |
| 4. | Huai Ruam | ห้วยร่วม | 11 | 4,595 | |
| 5. | Huai Thua Tai | ห้วยถั่วใต้ | 7 | 2,178 | |
| 6. | Huai Thua Nuea | ห้วยถั่วเหนือ | 9 | 3,580 | |
| 7. | Huai Yai | ห้วยใหญ่ | 6 | 2,938 | |
| 8. | Thung Thong | ทุ่งทอง | 14 | 9,876 | |
| 9. | Wang Bo | วังบ่อ | 14 | 11,020 |