The Stockholm Metro (Swedish: Stockholms tunnelbana) has 100 stations in use, of which 47 are subterranean and 53 are above ground (surface and elevated) stations. There are seven lines numbered from 10 to 19, in three groups identified by a colour: the Green, Red and Blue Lines. Each colour line has two or three numbered lines on shared sections through the Stockholm City Centre.

The decision to build a metro was made in 1941. The following years, some routes were built with near metro standard but operated with trams. The first part of the metro was opened in 1950, when an underground tram line from 1933 was converted to metro standard.