The Tehran Metro is a rapid transit system serving Tehran, the capital of Iran. The system consists of 4 operational lines, with construction having begun on a further two lines in 2007.

The line uses standard gauge. Ticket price is 1200 IRR for each journey (about USD 0.10), regardless of distance. Seniors may travel for free on the metro. On all Tehran metro trains, the first and half of the second and last and half of the last but one carriages are reserved for women who do not wish to ride with men in the same car. However, women can still ride other cars freely.

The Tehran Metro carries more than 2 million passengers a day. In 2010, 459 million trips were made on Tehran Metro.

The initial plans of the Tehran Metro, which was to be Iran's first metro system, were laid out before the Iranian revolution in the 1970s. In 1970 the Plan and Budget Organization and the Municipality of Tehran announced an international tender for construction of a metro in Tehran. The French company SOFRETU, affiliated with the state-owned Paris transportation authority RATP, won the tender and in the same year began to conduct preliminary studies on the project. In 1974, a final report with a so-called 'street-metro' proposal was tendered. The street-metro system recommended a road network with a loop express way in the central area and 2 highways for new urban areas and a 8-line metro network which were complemented by bus network and taxi services. Geological surveys commenced in 1976. In 1978 construction on the line was started in northern Tehran by the French company, however this development was short-lived with the advent of the Iranian Revolution and Iran–Iraq War in 1979 and 1980 respectively. SOFRETU ceased operations in Iran in December 1980. On March 3, 1982, the Iranian Cabinet ministers formally announced the stop of Tehran Metro operations by the French company.

Tehran ( pronunciation (help·info)) (Persian: تهران‎ Tehrān; pronounced [tehˈɾɒːn]), sometimes spelled Teheran, is the capital of Iran and Tehran Province. With an estimated population of 8,429,807; it is also Iran's largest urban area and city, the largest city in Western Asia, one of the largest in Southern Asia, and the 19th-largest city globally.

In the 20th century, Tehran was subject to mass-migration of people from all around Iran. The city is home to many historic mosques, churches, synagogues and Zoroastrian fire temples. Contemporary Tehran is a modern city featuring many structures, of which the Azadi (Freedom) Tower and the Milad Tower have come to be symbols of Tehran itself. In 2008 Tehran was the least expensive capital in the world and the second-least expensive city globally based on the cost-of-living index presenting the best value for money in the world. Globally it stands 19th by city population, 56th by the size of its GDP and 29th by the population of its metropolitan area. Throughout Iran's history, the capital city has been relocated many times, with Tehran being the 32nd national capital of Iran. Persian is the city's native tongue, with roughly 98% of the population able to speak and understand it. The majority of people in Tehran identify themselves as Persians. In pre-Islamic and early Islamic times, Tehran was called Ray (which in the Avesta occurs in the form of Ragha)^{[citation needed]}.