Hesar-e Valiyeasr (Persian: حصار ولي عصر) is a village in, and the capital of, Hesar-e Valiyeasr Rural District of the Central District of Avaj County, Qazvin province, Iran.

At the 2006 National Census, its population was 666 in 170 households, when it was in the former Avaj District of Buin Zahra County. The following census in 2011 counted 853 people in 258 households. The latest census in 2016 showed a population of 904 people in 247 households, by which time the district had been separated from the county in the establishment of Avaj County.