Mueang Kalasin (Thai: เมืองกาฬสินธุ์, pronounced [mɯ̄aŋ kāː.lā.sǐn]; Northeastern Thai: เมืองกาฬสินธุ์, pronounced [mɯ᷇aŋ kāː.lā.sǐn]) is the capital district (amphoe mueang) of Kalasin province, northeastern Thailand.

Neighboring districts are (from the north clockwise) Sahatsakhan, Somdet, Na Mon, Don Chan, Kamalasai, Khong Chai, Yang Talat, and Nong Kung Si of Kalasin Province.

[1] The district is divided into 17 sub-districts (tambons), which are further subdivided into 180 villages (mubans).

The town (thesaban mueang) covers the whole tambon Kalasin.

Missing numbers are tambons which now form Don Chan District.