Banasar (, also Romanized as Bānāṣar) is a village in Khoshabar Rural District, in the Central District of Rezvanshahr County, Gilan Province, Iran.
At the time of the 2006 National Census, the village's population was 33 in 8 households. The following census in 2011 counted 14 people in six households. The 2016 census measured the population of the village as 14 people in 5 households.
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