Estunabad () is a village in Banafsheh Tappeh Rural District of Now Kandeh District in Bandar-e Gaz County, Golestan province, Iran.
At the time of the 2006 National Census, the village's population was 570 in 151 households. The following census in 2011 counted 573 people in 170 households. The 2016 census measured the population of the village as 552 people in 182 households.