Hoseynabad () is a village in Shamkan Rural District of Shamkan District in Sheshtamad County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 961 in 216 households, when it was in the former Sheshtamad District of Sabzevar County. The following census in 2011 counted 974 people in 261 households. The 2016 census measured the population of the village as 1,046 people in 308 households.
In 2020, the district was separated from the county in the establishment of Sheshtamad County, and the rural district was transferred to the new Shamkan District.