Kham Muang (Thai: คำม่วง, pronounced [kʰām mûa̯ŋ]) is the northernmost district (amphoe) of Kalasin province, northeastern Thailand.

Neighboring districts are (from the southeast clockwise): Somdet, Sahatsakhan, Sam Chai of Kalasin Province; Wang Sam Mo of Udon Thani province; Kut Bak and Phu Phan of Sakon Nakhon province.

The minor district (king amphoe) was established on 1 October 1972, when the three tambons Thung Khlong, Phon, and Sam Ron were split off from Sahatsakhan district.

[2] The district is divided into six sub-districts (tambons), which are further subdivided into 70 villages (mubans).

Missing numbers are tambons which now form Sam Chai District.