Copenhagen South station (Danish: København Syd Station, previously Ny Ellebjerg Station) is a main line and S-train railway station in the district of Valby in southwestern Copenhagen, Denmark. The station is located on numerous railway and branch lines passing through or diverging from the main lines at this station, and is gradually being developed into a major transport hub for public transport in Copenhagen.

The station is located on the S-train and main line network. It serves as an interchange station between the Køge radial (lines A and E), the Ring Line (line F), and trains on the Copenhagen–Ringsted Line (InterCity and regional train services).

Copenhagen South station was originally opened under the name Ny Ellebjerg (Ny meaning "New") as an interchange station between the Køge Bugt Line and the Ring Line of the Copenhagen S-train system. Before the station opened on 6 January 2007, there was an S-train station called Ellebjerg station a few hundred metres southwest of the current station, where the Køge Bugt Line passes over Ellebjergvej. That station is now closed.

New platforms were opened in 2013 for the high-speed Copenhagen–Ringsted Line, on which trains run via Køge North to Ringsted, in future at up to 250 km/h.

The station's name was changed from Ny Ellebjerg to København Syd (Copenhagen South) on 10 December 2023, in connection with the station's development into a major transport hub.

Copenhagen South station became the southern terminus of the M4 line of the Copenhagen Metro, when the extension opened on 22 June 2024.

The metro station is decorated with walls in shades of blue from light sky blue at the top to deep midnight blue at the bottom by the platforms. In addition, there is a work of art in the form of a geocentric, astronomical clock, which will show a precise picture of some of the heavenly bodies's current location above Copenhagen South. A robotarm moves around magnetic discs representing the Sun, Moon, planets, stella nova (Tycho Brahe's supernova from 1572) and Sagittarius A*, the black hole at the center of the Milky Way. The artwork was created by the Danish artist Henrik Plenge Jakobsen.

Further main line platforms will be built around 2024 for trains going from Sweden and Copenhagen Airport by the Øresund Line to the high-speed Copenhagen-Ringsted Line (intended for the Fehmarn Belt Fixed Link), or reverse.

• 
  Entrance to M4 line
• 
  Escalators leading down to M4 platform
• 
  Artwork by Henrik Plenge Jakobsen
• 
  Intercity platforms in 2016
• 
  S-train platforms of the Ring Line (line F)
• 
  S-train platforms of the Køge Bay Line (lines A and E)

• List of railway stations in Denmark
• Rail transport in Denmark
• Transportation in Copenhagen
• Transportation in Denmark
• Danish State Railways
• Banedanmark

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• Official website
• (in Danish) Banedanmark – government agency responsible for maintenance and traffic control of most of the Danish railway network
• (in Danish) DSB – the Danish national train operating company
• (in English) The Copenhagen Metro
• (in Danish) Danske Jernbaner – website with information on railway history in Denmark