National Aquarium Denmark, Den Blå Planet is a public aquarium in Denmark. The original aquarium was located in Charlottenlund, but this facility closed in 2012 and most of the animal collection was relocated to the new and much larger aquarium Den Blå Planet (The Blue Planet).

The opened to the public in March 2013 and is the largest aquarium in Northern Europe.

It resembles a whirlpool when seen from above and designed by Danish architects 3XN. To reduce energy consumption the building is equipped with cooling units using seawater from Øresund and double glazing. It covers a total of 12,000 m2 (130,000 sq ft), including the 10,000 m2 (110,000 sq ft) building and 2,000 m2 (22,000 sq ft) outdoors (excluding parking spaces).