Kasimovsky District (Russian: Каси́мовский райо́н) is an administrative[1] and municipal[5] district (raion), one of the twenty-five in Ryazan Oblast, Russia.

The area of the district is 2,969 square kilometers (1,146 sq mi).

[8] Within the framework of administrative divisions, Kasimovsky District is one of the twenty-five in the oblast.

[1] The town of Kasimov serves as its administrative center,[2] despite being incorporated separately as a town of oblast significance—an administrative unit with the status equal to that of the districts.

[5] The town of oblast significance of Kasimov is incorporated separately from the district as Kasimov Urban Okrug.