Si That (Thai: ศรีธาตุ, pronounced [sǐː tʰâːt]) is a district (amphoe) in the southeastern Udon Thani province, northeastern Thailand.

Neighboring districts are (from the west clockwise) Kumphawapi, Ku Kaeo, Chai Wan and Wang Sam Mo of Udon Thani Province, and Tha Khantho of Kalasin province.

The minor district (king amphoe) Si That was created on 1 March 1968 by splitting off the five tambons Champi, Na Yung, Nong Ya Sai, Ban Prong, and Nong Kung Thap Ma from Kumphawapi district.

[2] The district is divided into seven sub-districts (tambons), which are further subdivided into 81 villages (mubans).

This Udon Thani Province location article is a stub.