| Official Name: | Tha Uthen |
| Native Name: | ท่าอุเทน |
| Native Name Lang: | th |
| Settlement Type: | Amphoe |
| Subdivision Type: | Country |
| Subdivision Name: |  Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Nakhon Phanom |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Non Tan |
| Population Total: | 59349 |
| Population As Of: | 2015 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 48120 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 4803 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 17.5569°N 104.6125°W |
Tha Uthen (Thai: ท่าอุเทน, in Thai pronounced as /tʰâː ʔù.tʰēːn/; ท่าอุเทน, in Lao pronounced as /tʰāː ʔǔ.tʰe᷇ːn/) is a district (amphoe) of Nakhon Phanom province, northeastern Thailand.
Neighboring districts are (from the south clockwise) Mueang Nakhon Phanom, Phon Sawan, Si Songkhram, and Ban Phaeng of Nakhon Phanom Province. To the east across the Mekong river is the Laotian province Khammouan.
The original location of Muang Tha Uthen was at present-day tambon Chaiburi, then named Chai Rit Uttaburi (ไชยฤทธิ์อุตตบุรี). It was founded in 1808 by the Tai Nyo leader Thao Mo and his wife, Sunantha, who moved people from Muang Hongsavadi of present-day Laos. Thao Mo was then awarded with the title Phraya Hongsawadi.
In 1814 the temple (Wat) Sri Sunanthamaharam was built, which later was called Wat Traiphum.
In 1833, Phraya Maha Ammat, a military leader moved people from the current Lao side of Mekong River and settled them on the current Thai side of the river. Thao Prathum was the first leader of Tha Uthen city and received the title Phra Sri Worasan.
After Phra Sri Worasan died in 1866, Phra Chamroenpholrop was promoted to be the leader of the city.
In 1870 King Mongkut assigned his son, Phra Sri Worarat, to be the leader of Tha Uthen. He died in 1899. Later the Ministry of Interior decided that the city should no longer have a royal family member as its leader, but be led by an assigned governor.
In 1907 the muang was converted into a district. Chanthima Pholdecha became the first district officer.
Tha Uthen is divided into nine sub-districts (tambon), which are further subdivided into 111 administrative villages (Muban).
| No. | Name | Thai | Villages | Pop.[1] | |
|---|---|---|---|---|---|
| 1. | Tha Uthen | Thai: ท่าอุเทน | 7 | 4,923 | |
| 2. | Non Tan | Thai: โนนตาล | 15 | 7,506 | |
| 3. | Tha Champa | Thai: ท่าจำปา | 16 | 8,900 | |
| 4. | Chaiburi | Thai: ไชยบุรี | 17 | 8,460 | |
| 5. | Phanom | Thai: พนอม | 11 | 5,293 | |
| 6. | Phathai | Thai: พะทาย | 10 | 4,960 | |
| 11. | Woen Phrabat | Thai: เวินพระบาท | 10 | 6,166 | |
| 12. | Ram Rat | Thai: รามราช | 17 | 8,772 | |
| 14. | Nong Thao | Thai: หนองเทา | 8 | 4,369 |
There are two sub-district municipalities (thesaban tambon) in the district:
There are seven subdistrict administrative organizations (SAO) in the district: