Kalasin is one of the provinces (changwat) of Thailand, located in the North-East of Thailand. The province was established by the Act Establishing Changwat Kalasin, BE 2490 (1947), which came into operation as from October 1, 1947.
Neighboring provinces are (from north clockwise) Sakon Nakhon, Mukdahan, Roi Et, Maha Sarakham, Khon Kaen and Udon Thani
