Tehran Metro, the rapid transit system serving Tehran, Iran, opened on March 7, 1999, and is the largest metro system in the Middle East.
Initial plans for the metro system were laid in the late 1960s. However, the plans could not be executed until 1982 due to socio-political issues, including the Iranian Revolution and the Iran-Iraq War.
The standard-gauge system, which carries more than 3 million passengers daily, comprises six operational metro lines and an additional commuter rail line. The Tehran Urban and Suburban Railway owns and operates the system.
As of 2025, construction is underway on seven lines, including the northwestern extension of Line 4, the southern extension of Line 6, the northwestern and eastern extension of Line 7, and the eastern extension of Lines 2, 8, 9, and 10.
The most recent line to open was Line 7, which opened in 2017.
As of December 2023, the total system was 181.5 miles long, 139.6 miles of which is metro-grade rail. Plans call for 270 miles over 11 lines once construction is complete by 2040.
The service began with an overland express electric train operating 19.5 miles between Azadi Square in Tehran and Malard in Karaj. It made one stop at Vardavard.