| Official Name: | In Buri |
| Native Name: | อินทร์บุรี |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Sing Buri |
| Subdivision Type2: | Seat |
| Subdivision Name2: | In Buri |
| Subdivision Type3: | Tambon |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 57771 |
| Population As Of: | 2007 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 16110 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 1706 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 15.0078°N 100.3269°W |
In Buri (Thai: อินทร์บุรี, in Thai pronounced as /ʔīn bū.rīː/) is the northernmost district (amphoe) of Sing Buri province in central Thailand.
In Buri is an ancient city, one of the major mueang or city states. It was built in the reign of King Ramesuan in 1369. In the Ayutthaya era, the governor of In Buri always was a royal family member because In Buri was a northern frontier city of Ayutthaya. The Thesaphiban administrative reforms of King Rama V downgraded In Buri to a subordinate of Sing Buri in 1895. It was converted into a district of Sing Buri Province later.
Neighboring districts are (from the north clockwise) Takhli of Nakhon Sawan province, Ban Mi of Lopburi province, Mueang Sing Buri and Bang Rachan of Sing Buri Province, and Sapphaya and Sankhaburi of Chai Nat province.
The district is divided into 10 sub-districts (tambons), which are further subdivided into 101 villages (mubans). In Buri itself is a sub-district municipality which covers parts of tambon In Buri. There are another 10 tambon administrative organizations (TAO).
| No. | Name | Thai | Pop. | |
|---|---|---|---|---|
| 1. | In Buri | อินทร์บุรี | 11,150 | |
| 2. | Prasuk | ประศุก | 6,221 | |
| 3. | Thap Ya | ทับยา | 6,161 | |
| 4. | Ngio Rai | งิ้วราย | 5,604 | |
| 5. | Chi Nam Rai | ชีน้ำร้าย | 4,386 | |
| 6. | Tha Ngam | ท่างาม | 5,340 | |
| 7. | Nam Tan | น้ำตาล | 3,584 | |
| 8. | Thong En | ทองเอน | 7,977 | |
| 9. | Huai Chan | ห้วยชัน | 4,909 | |
| 10. | Pho Chai | โพธิ์ชัย | 2,439 |