Sergachsky District (Russian: Серга́чский райо́н) is an administrative district (raion), one of the forty in Nizhny Novgorod Oblast, Russia.

[3] It is located in the southeast of the oblast.

The area of the district is 1,243.8 square kilometers (480.2 sq mi).

[1] Its administrative center is the town of Sergach.

[6] The population of Sergach accounts for 68.3% of the district's total population.