Golestan province (Persian: استان گلستان) is one of the 31 provinces of Iran, located in the northeast of the country and southeast of the Caspian Sea. Its capital is the city of Gorgan, formerly called Esterabad until 1937. Golestan was split off from Mazandaran Province in 1997.
The province was made a part of Region 1 upon the division of the provinces into 5 regions, solely for coordination and development purposes, on 22 June 2014. Majority of its population are Sunni Muslims.