Galshar (, also Gal-Shar, Buyant) is a sum (district) of Khentii Province in eastern Mongolia. Sum center former location was 41 33 49 16N 110 46 04 16 E. In 2010, its population was 1,807.
In 1931, the district was divided into Galshar and Buyant districts. However, in 1979 they were both reunified.
Galshar is the southern most district in Khentii Province. It is also the third largest district in the province.
The district is divided into six bags, which are: