Cruise lines have spent the past few years racing to build ever-larger ships, and three of the newest giants only entered service in 2026. Each vessel on this list tops 200,000 gross tons and can carry thousands of passengers at once, blurring the line between ship and floating resort. Here are twelve of the biggest cruise ships sailing today.
1. Icon of the Seas: Icon-Class Debut
The Icon of the Seas is Royal Caribbean’s first Icon-class ship, weighing 248,663 gross tons and sailing since 2024, according to the largest ships list.
As the debut ship in Royal Caribbean’s Icon class, it introduced a new generation of megaships built around themed neighborhoods, water parks and expansive open decks, setting the template that its two Icon-class sister ships have since followed into service. Royal Caribbean built the ship at a Finnish shipyard specializing in megaships, and its launch drew global attention as the largest passenger vessel ever constructed at the time.
2. Star of the Seas: Icon-Class Sister Ship
Star of the Seas is the second Icon-class ship, matching its sister at 248,663 gross tons, and joined the fleet in 2025, per the same largest-ships list.
Sharing its sister ship’s tonnage and layout, Star of the Seas shows how Royal Caribbean is repeating its Icon-class design across multiple hulls rather than building one-off flagships, a strategy that keeps construction and operating costs more predictable across the growing fleet. Both Icon-class ships sail similar Caribbean itineraries out of Florida, giving vacationers two nearly identical options depending on sailing dates and port availability.
3. Legend of the Seas: Newest Icon-Class Giant
Legend of the Seas is the newest Icon-class ship, also weighing 248,663 gross tons and carrying up to 5,610 passengers, according to a cruise ship ranking.
Entering service in 2026, Legend of the Seas is one of three brand-new ships on this list debuting the same year, extending Royal Caribbean’s run of identical Icon-class sisters to three near-matching vessels sailing at once. Its arrival pushed the Icon class past two hundred and forty-eight thousand gross tons for a third straight hull, a scale unmatched anywhere else in the cruise industry.
4. Utopia of the Seas: Newest Oasis-Class Ship
Utopia of the Seas is the newest ship in Royal Caribbean’s Oasis class, weighing 236,860 gross tons and holding up to 6,509 passengers, per a ship size comparison.
The Oasis class predates the newer Icon class but still fills out most of the top ten by tonnage, and like its sister ships it splits its many decks into distinct neighborhoods such as a boardwalk and a park lined with real trees.
5. Wonder of the Seas: Highest Passenger Count
Wonder of the Seas weighs 235,600 tons and can carry up to 7,084 passengers, the highest capacity of any ship on this list, according to the same cruise ship comparison.
As the fifth Oasis-class ship built, Wonder of the Seas benefited from years of refinements to the design, and its move to year-round Caribbean sailings after an initial run based in Asia made it one of the more accessible megaships for North American travelers.
6. Symphony of the Seas: Oasis-Class Veteran
Symphony of the Seas has weighed in at 228,081 gross tons since entering service in 2018, according to the largest cruise ships list.
Now approaching a decade in service, Symphony of the Seas remains one of the larger Oasis-class ships despite being among the older vessels on this list, a reminder that ships launched years ago can still rank among the very biggest afloat today. The ship continues to sail regular Caribbean and transatlantic itineraries, giving travelers a well-tested option among Royal Caribbean’s largest vessels.
7. Harmony of the Seas: Long-Serving Megaship
Harmony of the Seas has sailed since 2016 at 226,963 gross tons and can carry 5,479 passengers, per a ship size ranking.
A decade of service has not knocked Harmony of the Seas out of the top ten by size, and Royal Caribbean has periodically refreshed its onboard venues to keep the ship competitive against newer, larger arrivals within its own growing fleet of megaships. Its continued popularity shows how a well-designed megaship can stay in high demand for years after newer, larger sisters enter the fleet.
8. Oasis of the Seas: The Original Megaship
Oasis of the Seas started the modern megaship era in 2009 and still ranks in the top ten today at 226,838 gross tons and 5,602 passengers, according to the same size ranking.
More than fifteen years after its debut, Oasis of the Seas paved the way for every other Royal Caribbean ship on this list, proving out the neighborhood-style megaship concept before Allure, Harmony, Symphony, Wonder, Utopia and the newer Icon class all followed.
9. Allure of the Seas: 1,187-Foot Sister Ship
Allure of the Seas measures 225,282 tons and stretches 1,187 feet, according to the cruise ship size comparison.
As Oasis of the Seas’s near-identical sister ship, Allure was built to the same basic dimensions and neighborhood layout, and the two vessels have spent years trading places for bragging rights as the largest ship afloat before newer Royal Caribbean classes overtook them both. Both ships have carried millions of passengers through the Caribbean since their debuts, cementing the Oasis class as one of the most recognizable ship designs at sea.
10. MSC World America: MSC’s US Flagship
MSC World America weighs 216,683 tons, making it MSC Cruises’ biggest ship based in the United States, according to the same size comparison.
The ship represents MSC’s push to compete directly with Royal Caribbean and Carnival on American itineraries, giving the Swiss-based line its largest year-round presence yet in a cruise market long dominated by U.S.-headquartered brands sailing out of Florida ports. Its size lets MSC offer the kind of large-ship amenities, from multiple pools to numerous dining venues, that American cruisers have come to expect from domestic megaships.
11. MSC World Asia: MSC’s Asia Debut
MSC World Asia entered service in 2026 at 215,863 gross tons with room for 6,758 guests, per a cruise ship ranking.
As one of three ships on this list to debut in 2026, MSC World Asia extends the World class into Asian markets, giving MSC a ship built to the same scale as its Americas- and Europe-based sister ships already in service. Sister ship MSC World Europa already sails in the Mediterranean, so the World class now spans three continents under a single design.
12. Disney Adventure: Disney’s Largest Ship
Disney Adventure is Disney Cruise Line’s largest ship ever built, stretching 1,122 feet and holding about 6,700 guests, according to Disney’s own announcement.
The ship has sailed from Singapore since March 2026, marking Disney Cruise Line’s first ship based permanently in Asia and its biggest bet yet on reaching cruise passengers outside its traditional North American and European home markets. Its Singapore homeport also gives Southeast Asian travelers direct access to a scale of ship previously found mainly in North American and European waters.
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