SeaWorld is a chain of marine mammal parks in the United States. The parks feature Orca, sea lion, and dolphin shows and zoological displays featuring various other marine animals. The parks' icon is Shamu, the Orca. There are operations in Orlando, Florida; San Diego, California; San Antonio, Texas; and previously Aurora, Ohio. On March 5, 2007, SeaWorld Orlando announced addition of the Aquatica water park to its adventure park family, which already includes SeaWorld and Discovery Cove. On February 28, 2008 Busch Entertainment announced plans to open a fourth SeaWorld park in Dubai, UAE.

SeaWorld parks also feature a variety of thrill rides, including roller coasters like Kraken at SeaWorld Orlando and Steel Eel and The Great White at SeaWorld San Antonio. Journey to Atlantis, a combination roller coaster and splashdown ride, can be found at all three US parks. The parks are owned by Busch Entertainment Corp., the family entertainment division of Anheuser-Busch, which is best known for brewing beer but also owns nine theme parks. Some of the Budweiser Clydesdales are also kept at each park as an additional non-marine-oriented attraction.

One of the biggest attractions is the Shark Encounter, in which guests are carried through a submerged acrylic tube into the sharks' tank. Another famous ride is Wild Arctic, simulating a helicopter ride to the Arctic. After the ride, the guests arrive at a simulated base station, where they can observe polar bears, Pacific walruses, and beluga whales. Another attraction is the Penguin Encounter, showcasing a variety of penguins. In addition, an attraction features endangered Florida manatees. The park has an extensive playground for children, Shamu’s Happy Harbor (formerly called "Cap’n Kids’ World").

SeaWorld has made many contributions to wildlife conservation. SeaWorld scientists, zoologists, trainers and rescue teams participate in research and wildlife preservation. SeaWorld teams have helped save stranded whales, dolphins, seals, and sea lions and helped raise the awareness of endangered manatees. SeaWorld's commitment to conservation, research and animal rescue was recently formalized with the creation of the non-profit SeaWorld & Busch Gardens Conservation Fund. Sea World is accredited by the Association of Zoos and Aquariums, meaning they have met and exceeded the standards in Education, Conservation and Research.

Southwest Airlines is the "Official Airline of SeaWorld" and has three Boeing 737 aircraft painted to look like Shamu as an advertisement for SeaWorld.