Duminichsky District (Russian: Думи́ничский райо́н) is an administrative[1] and municipal[6] district (raion), one of the twenty-four in Kaluga Oblast, Russia.

It is located in the south central part of the oblast.

The area of the district is 1,174 km2 (453 sq mi).

[2] Its administrative center is the urban locality (a settlement) of Duminichi.

[10] The population of Duminichi accounts for 40.6% of the district's total population.