Pareh Sar District () is in Rezvanshahr County, Gilan province, Iran. Its capital is the city of Pareh Sar.
At the time of the 2006 National Census, the district's population wasAt the 2006 National Census, its population was 30,033 in 7,616 households. The following census in 2011 counted 29,809 people in 8,538 households. The 2016 census measured the population of the district as 28,251 inhabitants in 8,961 households.