| Official Name: | Muang Sam Sip |
| Native Name: | ม่วงสามสิบ |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ubon Ratchathani |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Muang Sam Sip |
| Subdivision Type3: | Tambon |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 82757 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 34140 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 3414 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 15.5108°N 104.7264°W |
Muang Sam Sip (th|ม่วงสามสิบ, pronounced as /th/) is a district (amphoe) in the northwestern part of Ubon Ratchathani province, northeastern Thailand.
In 1909 the government merged Kasem Sima and Utarupala Nikhom Districts together and named the new district Utara Ubon. Four years later, the district name was changed back to Kasem Sima.[1] The district office was moved to Ban Muang Sam Sip in 1917, so the district name was changed to fit with the new location. The government built a new the district office there in 1924. The present district office was rebuilt in 1993 in the same area.
Neighboring districts are (from the east clockwise) Lao Suea Kok, Mueang Ubon Ratchathani, Khueang Nai of Ubon Ratchathani Province and Hua Taphan, Lue Amnat and Phana of Amnat Charoen province.
The important water resources are the Se Bok and Se Bai Rivers.
The district is divided into 14 sub-districts (tambons), which are further subdivided into 158 villages (mubans). Muang Sam Sip is a township (thesaban tambon) which covers parts of tambon Muang Sam Sip. There are an additional 14 tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Muang Sam Sip | ม่วงสามสิบ | 12 | 9,318 | ||
| 2. | Lao Bok | เหล่าบก | 12 | 5,752 | ||
| 3. | Dum Yai | ดุมใหญ่ | 13 | 5,887 | ||
| 4. | Nong Chang Yai | หนองช้างใหญ่ | 8 | 4,730 | ||
| 5. | Nong Mueang | หนองเมือง | 14 | 7,873 | ||
| 6. | Toei | เตย | 12 | 7,676 | ||
| 7. | Yang Sak Krapho Lum | ยางสักกระโพหลุ่ม | 11 | 6,356 | ||
| 8. | Nong Khai Nok | หนองไข่นก | 8 | 3,419 | ||
| 9. | Nong Lao | หนองเหล่า | 15 | 6,926 | ||
| 10. | Nong Hang | หนองฮาง | 9 | 4,371 | ||
| 11. | Yang Yo Phap | ยางโยภาพ | 13 | 8,045 | ||
| 12. | Phai Yai | ไผ่ใหญ่ | 12 | 4,842 | ||
| 13. | Na Loeng | นาเลิง | 9 | 4,024 | ||
| 14. | Phon Phaeng | โพนแพง | 10 | 3,538 |