Una ciudad subterránea es una red de túneles que conectan edificios, normalmente del área central de una ciudad, como por ejemplo edificios de oficinas, centros comerciales, estaciones de tren y metro, teatros, y otras instalaciones. Normalmente se accede a una ciudad subterránea a través del espacio público de cualquiera de los edificios que conectan con ella, y a veces también dispone de entradas separadas. Las ciudades subterráneas son especialmente importantes en lugares con un clima frío, ya que permiten a sus ciudadanos disfrutar de los servicios del centro sin tener en cuenta los problemas del clima. Las ciudades subterráneas son similares en su naturaleza a los sistemas de pasarelas elevadas (llamados "skyway systems"), y pueden incluir también edificios interconectados mediante pasarelas elevadas, o pasillos a nivel de suelo, en vez de pasajes subterráneos. La ciudad subterránea más conocida y transitada del mundo es Montreal, Canadá.

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An underground city is a series of linked subterranean spaces that may provide a defensive refuge; a place for living, working or shopping; a transit system; mausolea; wine or storage cellars; cisterns or drainage channels; or several of these. The term may also refer to a network of tunnels that connects buildings beneath street level., which may house office blocks, shopping malls, metro stations, theatres, and other attractions. These passages can usually be accessed through the public space of any of the buildings connecting to them, and sometimes have separate entries as well. This latter definition encompasses many modern structures, whereas the former more generally covers tunnel systems from ancient times to the present day. Underground cities are especially functional in cities with very cold or hot climates, because they permit activities to be comfortably accessible year round without regard to the weather. Underground cities are similar in nature to skyway systems and may include some buildings linked by skyways or above-ground corridors rather than underground. Possibly the most famous underground cities are Montreal's RÉSO, used by more people than any other locale and the largest underground city network in the world, and Toronto's PATH, which according to Guinness World Records, is the largest underground shopping complex in the world with 371,600 square metres (3,999,869 sq ft) of retail space. Japan's underground networks, whereas individually smaller, are the most extensive overall with an estimated 76 underground shopping streets totaling over 900,000 square metres (9,687,519 sq ft) of floor space in 1996, with many expansions since then. Countries with underground cities include:

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