M2 is a line of the Copenhagen Metro, colored yellow on the map. It runs from Vanløse to Lufthavnen through the center of Copenhagen, sharing track with the M1 from Vanløse to Christianshavn. The line was built along with M1 as part of the redevelopment of Ørestad. The principle of the line was passed in 1992, and construction commenced in 1998. The line opened in several stages between 2002 and 2007. It is owned by Metroselskabet and operated by Metro Service, and operates with a headway between four and twenty minutes.

The line is 14.2 kilometers (8.8 mi) long, and runs in a tunnel through the city center between Lindevang and Amager Strand. It connects the western borough of Vanløse and the municipality of Frederiksberg to the city center of Copenhagen, as well as the eastern parts of Amager and Copenhagen Airport. It provides transfer to the S-train at three stations and to DSB trains at two stations.

Its southern end, in the district of Amager Øst, largely follows the same route as a disused railway line, Amagerbanen, along the coast of Øresund.