Waikīkī Aquarium is a public aquarium located in Honolulu, Hawaii, USA. It is part of the University of Hawaii and is situated on the eastern end of Waikīkī Beach, next to a living reef and across from Kapiolani Park. The aquarium is dedicated to showcasing the marine life of Hawaii and the tropical Pacific.

The Waikīkī Aquarium was founded in 1904 and is the second oldest public aquarium in the United States. It features over 500 different species of marine life, including fish, sharks, corals, and other invertebrates. The aquarium also has a number of exhibits that showcase the unique marine life of Hawaii, such as the Hawaiian Monk Seal and the Hawaiian Green Sea Turtle.

One of the highlights of the Waikīkī Aquarium is the outdoor exhibit called the Edge of the Reef, which replicates the natural environment of a coral reef. Visitors can see a variety of reef fish, such as angelfish, butterflyfish, and triggerfish, as well as sea urchins, sea stars, and other marine invertebrates.

In addition to its exhibits, the Waikīkī Aquarium also offers a variety of educational programs, including guided tours, lectures, and hands-on activities for children. It is open to the public every day except for Christmas Day and admission fees are charged for entry.