Monastyrshchinsky District (Russian: Монасты́рщинский райо́н) is an administrative and municipal district (raion), one of the twenty-five in Smolensk Oblast, Russia. It is located in the west of the oblast. The area of the district is 1,513.75 square kilometers (584.46 sq mi). Its administrative center is the urban locality (a settlement) of Monastyrshchino. Population: 10,788 (2010 Census); 13,876 (2002 Census); 17,559 (1989 Census). The population of Monastyrshchino accounts for 37.7% of the district's total population.