Vadsky District () is an administrative district (raion), one of the forty in Nizhny Novgorod Oblast, Russia. Municipally, it is part of the Vadsky Municipal District which is located in the southern central part of the oblast. The area of the district is with its administrative center located in the rural locality (a selo) of Vad. Its population is 15,626 according to the 2010 Census; and increased to The population of Vad accounts for 42.9% of the district's total population.
The district was established in 1929.