Sergach (Russian: Серга́ч) is a town and the administrative center of Sergachsky District in Nizhny Novgorod Oblast, Russia, located on the Pyana River (Sura's tributary), 150 kilometers (93 mi) southeast of Nizhny Novgorod, the administrative center of the oblast.

[citation needed] It was granted town status in 1779.

[citation needed] Within the framework of administrative divisions, Sergach serves as the administrative center of Sergachsky District.

[1] As an administrative division, it is, together with two rural localities, incorporated within Sergachsky District as the town of district significance of Sergach.

[1] As a municipal division, the town of district significance of Sergach is incorporated within Sergachsky Municipal District as Sergach Urban Settlement.