Symphysodon, colloquially known as discus, is a genus of cichlids native to the Amazon river basin in South America. Due to their distinctive shape, behavior, and bright colors and patterns, discus are popular as freshwater aquarium fish, and their aquaculture in several countries in Asia is a major industry. They are sometimes referred to as pompadour fish. The discus fish has attracted a cult following of collectors and has created a multimillion-dollar international industry complete with shows, competitions, and reputed online breeders.

In-home aquariums, discus lives for an average of 10 years, but can live up to 15 years, and can grow up to 8 inches. Like many fish in the home aquarium, they will eat almost anything that fits within their mouth. Due to their size, they often require a minimum 55–75 gallon aquarium.

Each year the World Discus Competition takes place in Guangzhou, China. The North American Discus Association focuses on both supporting hobbyists and helping to support wild discus.