Siahkal County is in Gilan province, Iran. Its capital is the city of Siahkal.

Gilan Province is one of the 31 provinces of Iran, in the northwest of the country. It lies along the Caspian Sea, in Iran's Region 3, west of the province of Mazandaran, east of the province of Ardabil, and north of the provinces of Zanjan and Qazvin. It borders Azerbaijan in the north.