Farg Qaleh () is a city in, and the capital of, Farah Dasht District in Kashmar County, Razavi Khorasan province, Iran.
In 2019, several villages were separated from the Central District in the formation of Farah Dasht District. The villages of Farahabad and Farg were transferred to Qaleh-ye Bala Rural District created in the new district. In 2021, the two villages were merged to form the new village of Farg Qaleh, which was converted to a city the following year.