Sain (Persian: سايين)[a] is a village in Yurchi-ye Sharqi Rural District of Kuraim District in Nir County, Ardabil province, Iran.

At the time of the 2006 National Census, the village's population was 287 in 50 households.

[4] The following census in 2011 counted 251 people in 66 households.

[5] The 2016 census measured the population of the village as 193 people in 53 households.

This Nir County location article is a stub.