Ubolratana (Thai: อุบลรัตน์, RTGS: Ubonrat, pronounced [ʔùʔ.bōn.rát]; Northeastern Thai: อุบลรัตน์, pronounced [ʔǔʔ.bōn.làt]) is a district (amphoe) of Khon Kaen province, northeastern Thailand.

The district is named after Princess Ubol Ratana, the eldest child of King Bhumibol Adulyadej.

The minor district (king amphoe) Ubolratana was established on 20 August 1974 by splitting the three tambons, Khok Sung, Na Kham, and Ban Dong from Nam Phong district.

[2][3] Neighboring districts are (from the north clockwise) Khao Suan Kwang, Nam Phong, Mueang Khon Kaen, Ban Fang, Nong Ruea and Phu Wiang of Khon Kaen Province, and Non Sang of Nong Bua Lamphu province.

The district is divided into six sub-districts (tambons), which are further subdivided into 68 villages (mubans).