The Kulebaksky 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 938.9 square kilometers (362.5 sq mi). Its administrative center was the town of Kulebaki. As of the 2010 Census, the total population of the district was 52,377, with the population of Kulebaki accounting for 68.3% of that number.