Gonabad County () is in Razavi Khorasan province, Iran. Its capital is the city of Gonabad.
In 2007, Bajestan District was separated from the county in the establishment of Bajestan County. The village of Rushnavand was converted to a city in 2020.
At the time of the 2006 National Census, the county's population was 106,158, in 30,357 households. The following census in 2011 counted 80,783 people in 24,292 households. The 2016 census measured the population of the county as 88,753 in 27,607 households.
Gonabad County's population history and administrative structure over three consecutive censuses are shown in the following table.
Gonabad is in a plate area on the north of the Brakoh mountain or Kà «h-e Tër MÃÂhë