The Central District of Nowshahr County () is in Mazandaran province, Iran. Its capital is the city of Nowshahr.
At the time of the 2006 National Census, the district's population was 102,131 in 27,814 households. The following census in 2011 counted 108,976 people in 32,279 households. The 2016 census measured the population of the district as 118,015 inhabitants in 38,431 households.