Monastyrshchinsky District 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 . Its administrative center is the urban locality (a settlement) of Monastyrshchino. Population: 10,788 (2010 Census); The population of Monastyrshchino accounts for 37.7% of the district's total population.