The Moscow Metro is a rapid transit system in the Moscow metropolitan area of Russia. It serves the capital city of Moscow and the neighbouring cities of Krasnogorsk, Reutov, Lyubertsy, and Kotelniki. Opened in 1935 with one 11-kilometre (6.8 mi) line and 13 stations, it was the first underground railway system in the Soviet Union.
As of January 2026, the Moscow Metro has 304 stations and 535.3 km (332.6 mi) of route length, making it the 8th-longest in the world, the longest in Europe and the longest outside China. It is also the only system in Russia with two circle lines. The system is mostly underground, with the deepest section 73 m (240 ft) underground at the Park Pobedy station, one of the world's deepest underground stations.