Khao Wong (Thai: เขาวง, pronounced [kʰǎw wōŋ]) is a district (amphoe) in the eastern part of Kalasin province, northeastern Thailand.

Neighboring districts are (from the south clockwise) Kuchinarai and Na Khu of Kalasin Province, Dong Luang and Khamcha-i of Mukdahan province.

The minor district (king amphoe) was created on 1 June 1969, when the five tambons Khum Kao, Song Plueai, Na Khu, Phu Laen Chang, and Nong Phue were split off from Kuchinarai district.

[2] The district is divided into six subdistricts (tambons), which are further subdivided into 59 villages (mubans).

Missing numbers are tambons which now form Na Khu District.