Mehrabad Airport is an airport serving Tehran, the capital city of Iran. Prior to the construction of the larger Imam Khomeini International Airport in 2007, Mehrabad was Tehran's primary airport for both international and domestic traffic, but now serves only domestic flights. Despite this, in 2016, Mehrabad Airport was the busiest airport in Iran in terms of passengers, handling 16,678,351 passengers in total. The airport is also used by the Government of Iran and is one of the bases of the Iranian Air Force.

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.