The Riga Metro (Latvian: Rīgas metro) was a planned metro system in Riga, Latvia, during the time of the Soviet Union. Three lines with a total of 33 stations were planned to be built by 2021, however in the late 1980s, during the Singing Revolution, the whole project met with opposition and combined with the fall of the Soviet Union, construction, which was planned to begin in 1990, never took place.
The population of the city has been declining due to emigration and negative population growth rate since 1990, making the prospects of a full metro system, even with EU funding, unrealistic in the near future. In fact, after the fall of the Soviet Union, possible construction of the metro system has even not been publicly discussed.
The idea of the Riga Metro emerged in the mid 1970s, when city planners were examining how to integrate traffic systems into the capital. Several concepts were proposed, including the reconstruction of the city's railway or the installation of high-speed tram lines. However, officials regarded both proposals as inefficient. The most pressing issue was that Riga's population was rising quickly and was expected to eventually surpass one million, the requirement for constructing a metro in the Soviet Union.