Pain Mahalleh-ye Qasemabad () is a village in Owshiyan Rural District of Chaboksar District in Rudsar County, Gilan province, Iran.
At the time of the 2006 National Census, the village's population was 487 in 138 households. The following census in 2011 counted 444 people in 143 households. The 2016 census measured the population of the village as 418 people in 149 households.