Vachsky District () is an administrative district (raion), one of the forty in Nizhny Novgorod Oblast, Russia. Municipally, it is incorporated as Vachsky Municipal District. It is located in the southwest of the oblast. The area of the district is . Its administrative center is the urban locality (a work settlement) of Vacha. Population: 19,979 (2010 Census); The population of Vacha accounts for 30.0% of the district's total population.
The district was established in 1929.