Qarah Aghaj () is a village in Abharrud Rural District of the Central District in Abhar County, Zanjan province, Iran.
At the time of the 2006 National Census, the village's population was 99 in 18 households. The following census in 2011 counted 110 people in 26 households. The 2016 census measured the population of the village as 101 people in 36 households.