How many large cruise lines are there?

As of October 2023, there are several major cruise lines operating globally, with the largest being Carnival Cruise Line, Royal Caribbean International, and Norwegian Cruise Line, among others. In total, there are about 10 to 15 prominent large cruise lines, depending on how one defines "large." These lines offer a range of itineraries and experiences, catering to various markets and preferences. Additionally, the cruise industry includes numerous smaller operators and niche lines.