Inzensky District (Russian: И́нзенский райо́н) is an administrative[1] and municipal[5] district (raion), one of the twenty-one in Ulyanovsk Oblast, Russia.

It is located in the west of the oblast.

The area of the district is 2,020.2 square kilometers (780.0 sq mi)[2] Its administrative center is the town of Inza.

[1] Population: 33,877 (2010 Census);[3] 40,083 (2002 Census);[7] 59,539 (1989 Soviet census).

[8] The population of Inza accounts for 55.5% of the district's total population.