Sian () is a village in Jarqavieh Sofla Rural District of the Central District of Jarqavieh County, Isfahan province, Iran.
The Shast-Sheshi festival, a rare surviving form of the ancient Zoroastrian feast of Khordadgan, is celebrated annually in Sian.
At the time of the 2006 National Census, the village's population was 224 in 65 households, when it was in Jarqavieh Sofla District of Isfahan County. The following census in 2011 counted 223 people in 74 households. The 2016 census measured the population of the village as 319 people in 109 households. It was the most populous village in its rural district.
In 2021, the district was separated from the county in the establishment of Jarqavieh County.