Middelgrundsfortet or Fort Middelgrund is a sea fort located on an artificial island in the Øresund between Copenhagen and Malmö. The fortress is constructed at a point where the seabed is 7 meters below the water surface, and at the northern meeting point of the straits Kongedybet and Hollænderdybet.
Christian IX's government constructed the fort between 1890–94 to serve as a part of Copenhagen's coastal fortifications, partly using material excavated from Frihavnen. It is one of three artificial islands that were created to defend the entrance to Copenhagen's harbour. (The other two are Flakfortet and Trekroner Fort.)
Middelgrundsfortet was the largest sea fortress in the world, and is still the largest man-made island without abutment, with an area, including wave breakers, of approximately 70 000 m²; the buildings total approximately 15 000 m². A HAWK battery was placed on the island in the 1950s. The fortress remained an active military installation until 1984; in 2002 it was sold to a private investor.
The Danish funds A. P. Møllerfonden and Nordeafonden together with the two scout organisations Det Danske Spejderkorps and KFUM-spejderne bought the island in April 2015  for 20 million Danish kroner (£1,94M) with money donated by Nordea-Fonden and A. P. Møller Fonden. The two Danish scout organisations intend to develop the island for all Danish youth to use, not just the scouts.
- "World's most covetable castles for sale". Daily Telegraph.
- "Film 7 Olsen banden på sporet / Die Olsenbande stellt die Weichen". olsenbande-homepage.de (in German). Retrieved 5 October 2017.
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