The Waikiki Aquarium is an aquarium in Honolulu, Hawaii, United States. Founded in 1904, it is the second oldest public aquarium in the United States. Since 1919, the Waikiki Aquarium has been an institution of the University of Hawaii at Manoa.
Built next to a living coral reef on the Waikiki shoreline, the Waikiki Aquarium is home to more than 3,500 organisms of 490 species of marine plants and animals. Each year, over 330,000 people visit, and over 30,000 schoolchildren participate in the Aquarium's education activities and programs. The Waikiki Aquarium was designated a Coastal Ecosystem Learning Center of the Coastal America Partnership federal program.