List of metro systems

For light metro systems, see Light metro § List of light metro systems.
See also: Rapid transit, List of suburban and commuter rail systems, and List of tram and light rail transit systems

Record-breakers from top to bottom: The Shanghai Metro has the highest annual ridership in the world. The Beijing Subway is the largest system in the world by total track length. The London Underground is the world's oldest metro system.

This list of metro systems includes electrified rapid transit train systems worldwide. In some parts of the world, metro systems are referred to as subways, undergrounds, tubes, mass rapid transit (MRT), métro or U-Bahn. As of 21 December 2025, 211 cities in 63 countries operate 939 metro lines.

The London Underground first opened as an underground railway in 1863 and its first electrified underground line, the City and South London Railway, opened in 1890, making it the world's first deep-level electric metro system. The Budapest Millennium Underground Railway, which opened in 1896, was the world's first electric underground railway specifically designed for urban transportation and is still in operation today. The Beijing Subway is the world's longest metro network at 879 kilometres (546 mi) and the busiest one with annual ridership approximately 2.83 billion passenger trips. As of 2024, the country with the most metro systems is China, with 54 in operation, including 11 of the 12 longest networks in the world.

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