Gilan Province (Persian: استان گیلان, Ostān-e Gīlān)[10] is one of the 31 provinces of Iran. 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.[11] It borders Azerbaijan (Astara District) in the north.

The northern part of the province is part of the territory of South (Iranian) Talysh. At the center of the province is the main city of Rasht. Other towns in the province include Astara, Astaneh-e Ashrafiyyeh, Fuman, Lahijan, Langarud, Masouleh, Manjil, Rudbar, Rudsar, Shaft, Hashtpar, and Sowme'eh Sara