Ulyanovsky District (Russian: Улья́новский райо́н) is an administrative[1] and municipal[4] district (raion), one of the twenty-four in Kaluga Oblast, Russia.

It is located in the south of the oblast.

The area of the district is 1,655.9 square kilometers (639.3 sq mi).

[2] Its administrative center is the rural locality (a selo) of Ulyanovo.

[8] The population of Ulyanovo accounts for 43.6% of the district's total population.