| Official Name: | Don Tan |
| Native Name: | ดอนตาล |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: |  Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mukdahan |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Don Tan |
| Established Title: | District established |
| Established Date: | 1963 |
| Population Total: | 42215 |
| Population As Of: | 2008 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 49120 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4903 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 16.3167°N 104.92°W |
Don Tan (in Thai pronounced as /dɔ̄ːn tāːn/) is the southeasternmost district (amphoe) of Mukdahan province, northeastern Thailand.
Originally Don Tan was a tambon of Mukdahan district, Nakhon Phanom province. Don Tan was upgraded to a minor district (king amphoe) in 1963,[1] which was further upgraded to a full district in 1974.[2] When the government established Mukdahan Province in 1982, Don Tan district was assigned to be a district of the new province.[3]
Neighboring districts are (from the southeast clockwise) Chanuman of Amnat Charoen province; Loeng Nok Tha of Yasothon province; Nikhom Kham Soi and Mueang Mukdahan of Mukdahan Province. To the east across the Mekong River is the Laotian province of Savannakhet.
The important water resource is the Mekong River.
The district is divided into seven sub-districts (tambons), which are further subdivided into 62 villages (mubans). Don Tan is a sub-district municipality (thesaban tambon) which covers parts of the tambon Don Tan. There are a further seven tambon administrative organizations (TAO).
| No. | Name | Thai | Villages | Pop.[4] | |
|---|---|---|---|---|---|
| 1. | Don Tan | ดอนตาล | 12 | 7,013 | |
| 2. | Pho Sai | โพธิ์ไทร | 7 | 4,686 | |
| 3. | Pa Rai | ป่าไร่ | 11 | 8,609 | |
| 4. | Lao Mi | เหล่าหมี | 9 | 6,595 | |
| 5. | Ban Bak | บ้านบาก | 7 | 5,432 | |
| 6. | Na Sameng | นาสะเม็ง | 9 | 7,047 | |
| 7. | Ban Kaeng | บ้านแก้ง | 7 | 2,833 |