Siyavashan (Persian: سياوشان)[a] is a village in, and the capital of, Siyavashan Rural District of the Central District of Ashtian County, Markazi province, Iran.

[4] At the time of the 2006 National Census, the village's population was 826 in 285 households.

[6] The 2016 census measured the population of the village as 686 people in 261 households.

It was the most populous village in its rural district.

This Ashtian County location article is a stub.