Cabrillo Marine Aquarium is an aquarium in San Pedro, California, United States, a community within Los Angeles. It concentrates on the marine life of Southern California. In addition to its displays, it also offers school and group programs.

The aquarium is operated by the City of Los Angeles Department of Recreation and Parks.[3]
Admission is free, but donations are suggested.

The original building was designed by Frank Gehry and completed in 1981. The 2004 addition /renovation was designed by Barton Phelps & Associates.

The original one-story, 23,000 square feet (2,100 m2) facility was designed by Frank Gehry & Associates. It clusters indoor and outdoor exhibit spaces, an auditorium, wet laboratories, and offices around a central open space wrapped in chain-link fencing. The look is fishing village industrial with occasional nautical references. Free-standing tanks served by exposed electrical and plumbing systems openly display mechanical functions.

In 2000, the City of Los Angeles commissioned the architecture firm of Barton Phelps & Associates to prepare a master plan for phased expansion of the aquarium. A 21,000 square feet (2,000 m2) two-story addition houses wet labs, offices, and the Moore Research Library. Courtyards accommodate outdoor exhibits and special events. A new screen of fiberglass tubes leads the eye back to the original chain-link entry kiosk.