Shedd Aquarium (formally the John G. Shedd Aquarium) is a public aquarium in Chicago, Illinois, United States. It is one of the oldest continually operating non-governmental aquariums in the U.S.
Opened on May 30, 1930, the 5 million US gal (19,000,000 L; 4,200,000 imp gal) aquarium holds about 32,000 animals. It is the third largest aquarium in the Western Hemisphere (after the Georgia Aquarium and The Seas at Epcot) and the 11th-largest aquarium in the world.
The Shedd Aquarium is a highly ranked world aquarium and at one time was the largest indoor facility in the world. It is the first inland aquarium with a permanent saltwater fish collection.