Hajj Rajab (, also Romanized as ḨÃÂjj Rajab; also known as ḨÃÂjjë Rajab and KalÃÂteh-ye ḨÃÂjjë Rajab) is a village in Qaleh-ye Bala Rural District of Farah Dasht District in Kashmar County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 135 in 30 households, when it was in Bala Velayat Rural District of the Central District. The following census in 2011 counted 37 people in 12 households. The 2016 census measured the population of the village as below the reporting threshold.
In 2019, Hajj Rajab was transferred to Qaleh-ye Bala Rural District created in the new Farah Dasht District.