The Copenhagen Metro is a 24/7 rapid transit system in Copenhagen, Denmark, serving the municipalities of Copenhagen, Frederiksberg, and Tårnby.

The original 20.4-kilometre system opened in 2002, serving nine stations on two lines: M1 and M2. In 2003 and 2007, the Metro was extended to Vanløse and Copenhagen Airport (Lufthavnen) respectively, adding an additional six plus five stations to the network. In 2019, seventeen stations on a wholly underground circle line, the M3, was added bringing the number of stations to 37.

Through the city center and west to Vanløse, M1 and M2 share a common line. To the southeast, the system serves Amager, with the 13.9-kilometre M1 running through the new neighborhood of Ørestad, and the 14.2-kilometre M2 serving the eastern neighborhoods and Copenhagen Airport. The M3 is a circle line connecting Copenhagen Central Station with Vesterbro, Frederiksberg, Nørrebro, Østerbro and Indre By districts. The metro has 37 stations, of which 24 are underground.

In 2018, the metro carried 64,7 million passengers.