Iranian Azerbaijanis are Iranians of Azerbaijani ethnicity. Most Iranian Azerbaijanis are bilingual in Azerbaijani and Persian. They are mainly of Iranian descent. They are primarily found in and are native to the Iranian Azerbaijan region including provinces of and in smaller numbers, in other provinces such as Kurdistan, Qazvin, Hamadan, Gilan, Markazi and Kermanshah. Iranian Azerbaijanis also constitute a significant minority in Tehran, Karaj and other regions.

Tehran is the capital and largest city of Iran and also the largest city in Tehran Province. It also serves as the capital of the province, county and the Central District. With a population of around 9 million and 400 thousand in the city and around 16 million and 800 thousand in the larger metropolitan area of Greater Tehran, The Greater Tehran metropolitan area contains towns like the "New Town of Andisheh", "Islam Shahr", "Shahreh Qods", "Shahryar", "Pakdasht", "Firooz Kooh" and "Shamiran". Tehran is the most populous city in Iran and Western Asia, and has the second-largest metropolitan area in the Middle East, after Cairo. It is ranked 24th in the world by metropolitan area population.