Carnival Cruises, specifically Carnival Cruise Line, is owned by Carnival Corporation & plc. This company is the world's largest cruise ship operator and is a dual-listed company with headquarters in the United States and the United Kingdom. Carnival Corporation & plc owns and operates eight cruise lines including Carnival Cruise Line, Holland America Line, Princess Cruises, Cunard, Costa Cruises, P&O Cruises, Seabourn Cruise Line, and AIDA Cruises. Carnival Cruise Line is the largest and most recognizable brand within this corporate group.