Tehran Province (Persian: استان تهران; transliterated ostān-e Tehrān) is one of the 30 provinces of Iran. It covers on area of 18,909 square kilometers and is located to the north of the central plateau of Iran.

Tehran Province borders Māzandarān Province in the north, Qom Province in the south, Semnān Province in the east, and Qazvīn Province in the west. The metropolis of Tehran is the capital city of the province and of Iran. As of June 2005, this province includes 13 townships, 43 municipalities, and 1358 villages.

The province gained importance when Tehran was claimed the capital by the Qajar dynasty in 1778. Today Tehran ranks in the top 20 metropolitan cities of the world in size.