巴彦洪戈尔省 (Баянхонгор аймаг) 位于蒙古国南部，面积116,000平方公里，人口84,779 (2000年)。首府巴彦洪戈尔。

Bayankhongor (Mongolian:Баянхонгор, literally Rich Darling) is one of the 21 aimags (provinces) of Mongolia. It is located in the southwest of the country and, at 116,000 square kilometers, it is one of the largest aimags. The capital of the aimag shares the provincial name, Bayankhongor.