The Central District of Buin Zahra County () is in Qazvin province, Iran. Its capital is the city of Buin Zahra.
The village of Esmatabad was converted to a city in 2020.
At the time of the 2006 National Census, the district's population was 49,649 in 12,716 households. The following census in 2011 counted 53,887 people in 15,394 households. The 2016 census measured the population of the district as 55,500 inhabitants in 16,779 households.