Royal Caribbean International continues to be a leader in the large cruise industry. In 2025, the group ushered in a new era for cruise travel by launching Icon of the Seas, which earned the title of the world's largest cruise ship.
Below is a list of the 10 largest cruise ships, transforming ocean travel into an unparalleled luxury experience.
1.Icon of the Seas - Royal Caribbean
Launched in January 2024, this is the largest cruise ship ever, with a gross tonnage of 250,800 GT. The newest member of the Royal Caribbean fleet is 364.75 meters long and has a maximum capacity of up to 7,600 passengers. It is the first Royal Caribbean cruise ship to utilize liquefied natural gas (LNG) and fuel cell technology. Unique features include 6 water slides, 8 neighborhoods, over 40 restaurants…
2.Utopia of the Seas - Royal Caribbean
This is the world's second-largest cruise ship, launched in 2024, measuring 362 meters in length, with a gross tonnage of 236,860 GT and a maximum capacity of 6,509 passengers. As the first LNG-powered cruise ship in the Oasis class, Utopia of the Seas offers a sustainable travel experience, perfect for exciting weekend adventures with over 20 restaurants, 3 water slides, 2 casinos, 5 swimming pools, and more.
3.Wonder of the Seas - Royal Caribbean
This luxury cruise ship, the Oasis, made its maiden voyage in 2022. With a gross tonnage of 235,600 GT and a length of 362 meters, the cruise ship can accommodate up to 7,084 passengers. Wonder of the Seas has 18 decks, 19 pools, 25 dining options...
4.Symphony of the Seas - Royal Caribbean
Launched in 2018, Symphony of the Seas reigned supreme as the world's largest cruise ship until 2022. With a gross tonnage of 228,081 GT and a maximum capacity of 6,680 passengers, this impressive Oasis-class vessel redefined the limits of passenger ships.
5.Harmony of the Seas – Royal Caribbean
Known as one of the most popular family cruise ships, Harmony of the Seas began its voyage in 2016. Measuring 362.2 meters in length and with a gross tonnage of 226,963 GT, Harmony of the Seas can accommodate up to 6,687 passengers and resembles a floating city with a plethora of world-class entertainment options.
6.Oasis of the Seas - Royal Caribbean
With its maiden voyage in 2009, the Oasis of the Seas is one of the most iconic passenger ships, pioneering the concept of a residential cruise ship. With a gross tonnage of over 226,838 GT and a maximum capacity of 6,771 passengers, the ship redefined the capabilities of the world's largest vessels.
7.Allure of the Seas - Royal Caribbean
With its maiden voyage in 2010, the Oasis cruise ship has become a jewel in Royal Caribbean International's world-class fleet. With 225,282 GT and a massive capacity of 6,780 passengers, the cruise ship received numerous prestigious awards at the time.
8.MSC World America - MSC Cruises
Launching in April 2025, MSC World America is the largest cruise ship operated by MSC Cruises. With a gross tonnage of 216,638 GT, 22 decks, a capacity of 6,762 passengers, and a sustainable LNG power system, this cruise ship is on par with the largest cruise lines.
9.MSC World Europa - MSC Cruises
The cruise ship embarked on its maiden voyage in December 2022 and is ranked as one of MSC's largest cruise ships currently in service. With a gross tonnage of 215,863 GT and a length of 333.3 meters, the ship can accommodate up to 6,762 passengers; 16 passenger decks, 13 restaurants, 20 bars, and more.
10.Costa Smeralda - Costa Cruises
Named after Sardinia's famous Emerald Coast, the Costa Smeralda is Costa Cruises' largest cruise ship. Launched in 2019, this liquefied natural gas (LNG) powered cruise ship boasts a gross tonnage of 185,010 GT, 20 decks, and a passenger capacity of 6,554.
What makes a cruise ship 'big'?
- Gross tonnage (GT): This is the primary unit of measurement, also referring to the total internal volume of a ship. 1 GT = 2.83 cubic meters. A higher GT means more interior space for various amenities.
-Length: The actual distance of the yacht, measured from bow to stern.
-Passenger capacity: The maximum number of passengers that can be served.
-Number of floors: This is a vertical scale specifically designed for dining, entertainment, and accommodation.
Why is size important in the yachting industry?
The more passengers on board, the lower the operating cost per passenger, making travel more accessible to a wider audience. More amenities and activities: The more spacious interior allows for a wider range of activities and amenities, including water parks, shopping areas, rock climbing, dining, and more.
The appeal and marketing of scale: The larger the cruise ship, the more people it attracts. Larger cruise ships often offer more stable rides even in rough seas.
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