| Official Name: | Prang Ku |
| Native Name: | ปรางค์กู่ |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Sisaket |
| Subdivision Type2: | Seat |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 68208 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 33170 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 3307 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 14.8567°N 104.04°W |
Prang Ku (Thai: ปรางค์กู่, in Thai pronounced as /prāːŋ kùː/) is a district (amphoe) in the western part of Sisaket province, northeastern Thailand.
Neighboring districts are (from the north clockwise): Huai Thap Than, Uthumphon Phisai, Wang Hin, and Khukhan of Sisaket Province; Si Narong, Sikhoraphum, and Samrong Thap of Surin province.
The minor district (king amphoe) Prang Ku was established on 1 January 1961, when it was split off from Khukhan district. The district is named after Prang Samong in Ban Ku. On 17 July 1963 it was upgraded to a full district.
The district is divided into 10 sub-districts (tambons), which are further subdivided into 141 villages (mubans). Prang Ku is a township (thesaban tambon) which covers parts of tambon Phimai and Phimai Nuea. There are a further 10 tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Phimai | พิมาย | 13 | 7,306 | ||
| 2. | Ku | กู่ | 17 | 12,182 | ||
| 3. | Nong Chiang Thun | หนองเชียงทูน | 19 | 9,439 | ||
| 4. | Tum | ตูม | 11 | 6,193 | ||
| 5. | Samo | สมอ | 17 | 7,522 | ||
| 6. | Pho Si | โพธิ์ศรี | 14 | 5,519 | ||
| 7. | Samrong Prasat | สำโรงปราสาท | 17 | 6,893 | ||
| 8. | Du | ดู่ | 13 | 4,794 | ||
| 9. | Sawai | สวาย | 10 | 4,082 | ||
| 10. | Phimai Nuea | พิมายเหนือ | 10 | 4,278 |