Tarsiab () is a village in Ahlamerestaq-e Jonubi Rural District of the Central District in Mahmudabad County, Mazandaran province, Iran.
At the time of the 2006 National Census, the village's population was 1,190 in 306 households. The following census in 2011 counted 1,707 people in 492 households. The 2016 census measured the population of the village as 1,773 people in 551 households, the most populous in its rural district.