乌汶（泰国：อุบลราชธานี，发音[ʔubon râːt.tɕʰa.tʰaːniː]）是伊善地区的四大城市之一 。这座城市位于泰国伊善地区的东南部的城门河。简称为乌汶（อุบลฯ）。这个名字的意思是“皇家莲花城”。省级密封设有一个带莲花和树叶在一个圆形框架的一个池塘。乌汶是乌汶省的行政中心。截至2006年，在乌汶市区拥有约20万人口。

Ubon Ratchathani is both a city and a province in Thailand. For the province, see Ubon Ratchathani province.

Ubon Ratchathani (Thai:อุบลราชธานี, pronounced [ʔubon râːt.tɕʰa.tʰaːniː]) is one of the four major cities of Isan (Khorat, Ubon Ratchathani, Udon Thani, and Khon Kaen), also known as the "big four of Isan". The city is on the Mun River in the south-east of the Isan region of Thailand. It is known as Ubon (อุบลฯ) for short. The name means "royal lotus city". The provincial seal features a pond with a lotus flower and leaves in a circular frame. Ubon was the administrative centre of Ubon Ratchathani Province. As of 2006, the Ubon urban area had a population of about 200,000. This included 85,000 in Thetsaban Nakhon Ubon Ratchathani (Ubon municipality), 30,000 each in Thetsaban Mueang Warin Chamrap (Warin municipality) and Thetsaban Tambon Kham Yai, 24,000 in Thetsaban Tambon Saen Suk, 10,000 in each of Thetsaban Tambon Pathum and Tambon Kham Nam Saep, and 6,000 in Thetsaban Tambon Ubon.