Carnival Cruise Lines is a British-American owned cruise line, based in the Doral suburb of Miami, Florida in the United States. Originally an independent company founded in 1972 by Ted Arison, the company is now one of eleven cruise ship brands owned and operated by Carnival Corporation & PLC.

The company has the largest fleet in the group, with twenty two vessels currently in operation. Executive control of the company is provided by the North American division of Carnival Corporation, headquartered in Doral, Florida. Carnival was a pioneer in the concept of shorter, less expensive cruises. Its ships are known for their Las Vegas-style decor and entertainment. The line calls its ships The Fun Ships, and there are a wide range of activities offered on board. Its trademark is the smoke stack, or funnel, which is red, white and blue and shaped like a whale's tail. The mascot for Carnival is "Fun Ship Freddy", a character in the shape of Carnival's distinctive funnel.