Chaku Sar () is a village in Molla Sara Rural District of the Central District in Shaft County, Gilan province, Iran.
At the time of the 2006 National Census, the village's population was 961 in 262 households. The following census in 2011 counted 862 people in 259 households. The 2016 census measured the population of the village as 787 people in 265 households.