Navashinsky District was an administrative and municipal district (raion) in Nizhny Novgorod Oblast, Russia. It was located in the southwest of the oblast. The area of the district was 1,277.5 square kilometers (493.2 sq mi). Its administrative center was the town of Navashino. As of the 2010 Census, the total population of the district was 24,296, with the population of Navashino accounting for 67.6% of that number.