| Official Name: | Ban Rai |
| Native Name: | บ้านไร่ |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Uthai Thani |
| Subdivision Type2: | Seat |
| Subdivision Type3: | Tambon |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 66167 |
| Population As Of: | 2005 |
| Population Density Km2: | 18.3 |
| Area Total Km2: | 3621.5 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 61140 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 6106 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 15.0839°N 99.5211°W |
Ban Rai (th|บ้านไร่, pronounced as /th/) is a district (amphoe) in Uthai Thani province in western Thailand.
The district covers more than half of the province of Uthai Thani and is also the third-largest district in Thailand. A large part of the district is part of the Huai Kha Khaeng Wildlife Sanctuary.
Neighboring districts are (from the north clockwise) Mae Poen of Nakhon Sawan province; Lan Sak, Huai Khot, and Nong Chang of Uthai Thani Province; Nong Mamong, Hankha, and Noen Kham of Chai Nat province; Dan Chang of Suphan Buri province; Si Sawat and Thong Pha Phum of Kanchanaburi province; and Umphang of Tak province.
The district is divided into 13 sub-districts (tambons), which are further subdivided into 134 villages (mubans). There are two townships (thesaban tambon). Ban Rai covers parts of tambons Ban Rai and Ban Bueng, and Mueang Ka Rungcovers parts of the same-named tambon. There are a further 12 tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Ban Rai | บ้านไร่ | 11 | 8,616 | ||
| 2. | Thap Luang | ทัพหลวง | 15 | 7,988 | ||
| 3. | Huai Haeng | ห้วยแห้ง | 9 | 4,748 | ||
| 4. | Khok Khwai | คอกควาย | 16 | 7,154 | ||
| 5. | Wang Hin | วังหิน | 6 | 3,502 | ||
| 6. | Mueang Ka Rung | เมืองการุ้ง | 13 | 6,905 | ||
| 7. | Kaen Makrut | แก่นมะกรูด | 4 | 1,621 | ||
| 9. | Nong Chok | หนองจอก | 15 | 5,296 | ||
| 10. | Hu Chang | หูช้าง | 13 | 6,556 | ||
| 11. | Ban Bueng | บ้านบึง | 7 | 3,320 | ||
| 12. | Ban Mai Khlong Khian | บ้านใหม่คลองเคียน | 8 | 3,219 | ||
| 13. | Nong Bom Kluai | หนองบ่มกล้วย | 10 | 3,318 | ||
| 14. | Chao Wat | เจ้าวัด | 7 | 3,924 |
The village of Baan Tab Klai is known for its cultivation of eri silkworms to produce eri silk. Silkworm farmers have created a collective to produce the fibre using clean technologies such as all-natural dyes. The moths that produce the cocoons are not harmed in the process, leading some to call it "peace silk".[1]