Poshteh Abbas () is a village in Frughan Rural District of Rud Ab District in Sabzevar County, Razavi Khorasan province, Iran.
At the time of the 2006 National Census, the village's population was 34 in six households. The following census in 2011 counted 29 people in 10 households. The 2016 census measured the population of the village as zero.