Garah Zu () is a village in Ziarat Rural District of the Central District in Shirvan County, North Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 258 in 72 households. The following census in 2011 counted 321 people in 96 households. The 2016 census measured the population of the village as 345 people in 107 households.