Asiab Sar () also known as ÃÂsyo Sar in Mazanderani language (âóÃÂàóñ) is a village in Kuhestan Rural District of the Central District in Behshahr County, Mazandaran province, Iran.
At the time of the 2006 National Census, the village's population was 1,598 in 427 households. The following census in 2011 counted 1,537 people in 499 households. The 2016 census measured the population of the village as 1,526 people in 555 households.
The main activities of the villagers are farming, gardening, and animal husbandry. The main agricultural products are wheat, rice, citrus fruits, sunflowers, soybeans, pomegranates, and cotton.