Hoseynabad () is a village in, and the capital of, Hoseynabad Rural District of Mehrdasht District, Najafabad County, Isfahan province, Iran.
At the time of the 2006 National Census, the village's population was 2,862 in 720 households. The following census in 2011 counted 2,986 people in 852 households. The 2016 census measured the population of the village as 3,087 people in 931 households. It was the most populous village in its rural district.