Ubon Ratchathani (Thai: อุบลราชธานี, pronounced [ʔù.bōn râːt.tɕʰā.tʰāː.nīː]; Northeastern Thai: อุบลราชธานี, pronounced [ʔǔ.bōn lâːt.sā.tʰa᷇ː.ni᷇ː]), often shortened to Ubon (อุบลฯ), is one of Thailand's seventy-six provinces lies in lower northeastern Thailand also called Isan.

[5] Neighboring provinces are (from west clockwise) Sisaket, Yasothon, and Amnat Charoen.

To the north and east it borders Salavan and Champasak of Laos, to the south Preah Vihear of Cambodia.

[1] The city was founded in the late 18th century by Thao Kham Phong, descendant of Phra Wo and Phra Ta, who escaped from King Siribunsan of Vientiane into Siam Kingdom during the reign of King Taksin the Great.

Later Thao Kham Phong was appointed to be "Phra Pathum Wongsa" The first ruler of Ubon Ratchathani.

As of 26 November 2019 there are:[15] one Ubon Ratchathani Provincial Administration Organisation (ongkan borihan suan changwat) and 60 municipal (thesaban) areas in the province.

Chaeramae, Det Udom, Phibun Mangsahan and Warin Chamrap have town (thesaban mueang) status.

The non-municipal areas are administered by 179 Subdistrict Administrative Organisations – SAO (ongkan borihan suan tambon).