Hoseynabad () is a village in Zahray-ye Bala Rural District of the Central District in Buin Zahra County, Qazvin province, Iran.
At the time of the 2006 National Census, the village's population was 1,119 in 280 households. The following census in 2011 counted 1,673 people in 466 households. The 2016 census measured the population of the village as 1,522 people in 470 households.