Davarzan County () is in Razavi Khorasan province, Iran. Its capital is the city of Davarzan.
In 2012, Davarzan District was separated from Sabzevar County in the establishment of Davarzan County, which was divided into two districts of two rural districts each, with Davarzan as its capital and only city at the time.
At the time of the 2016 National Census, the county's population was 21,911 in 7,678 households.
Davarzan County's population and administrative structure are shown in the following table.