Kun Rud Siahu () is a village in Gheynab Rural District of the Central District in Sarbisheh County, South Khorasan province, Iran.
Demographics At the time of the 2006 National Census, the village's population was 341 in 48 households, when it was in Momenabad Rural District. The following census in 2011 counted 271 people in 61 households. The 2016 census measured the population of the village as 248 people in 58 households, by which time it had been separated from the rural district in the formation of Gheynab Rural District.
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