Largest Cruise Ships Currently in Service
The cruise industry has witnessed an extraordinary evolution over the past two decades, with ships transforming from simple ocean vessels into floating cities that dwarf some of the world’s most famous landmarks. These massive structures stretch longer than the height of the Eiffel Tower laid on its side and pack more amenities than entire resort complexes.
The race to build bigger and more impressive ships has created some truly staggering feats of engineering, with the largest vessels now weighing in at nearly 250,000 gross tons and carrying thousands of passengers at a time. Here is a list of massive cruise ships that currently rule the seas.
Icon of the Seas
Royal Caribbean’s Icon of the Seas claimed the title of world’s largest cruise ship when it launched in January 2024. This behemoth measures 248,663 gross tons and stretches nearly 1,200 feet long, making it longer than four football fields placed end to end.
The ship holds up to 7,600 passengers across 20 decks and features everything from an ice skating rink to a suspended infinity pool that hangs over the ocean.
Star of the Seas
Sharing the crown with its sister ship, Star of the Seas joined the fleet in August 2025 as Royal Caribbean’s second Icon-class vessel. At 248,663 gross tons, it matches Icon’s impressive size while sailing exclusively from Port Canaveral, Florida.
The ship carries 5,610 passengers in double occupancy and includes six distinct neighborhoods, each offering different experiences for guests.
Utopia of the Seas
This Oasis-class giant from Royal Caribbean weighs in at 236,857 gross tons and entered service in 2024. Utopia of the Seas represents the latest evolution of a class that has dominated the ‘world’s largest’ conversation for over a decade.
The vessel accommodates around 5,668 passengers and features the signature Central Park neighborhood with over 12,000 live plants creating a green oasis at sea.
Wonder of the Seas
Wonder of the Seas held the title of world’s largest cruise ship from its January 2022 debut until Icon arrived two years later. At 235,600 gross tons, this Royal Caribbean ship measures 1,188 feet long and can host 5,734 passengers.
The vessel was the first Oasis-class ship to feature the Suite Neighborhood, an exclusive area with private amenities for suite guests.
Symphony of the Seas
Royal Caribbean’s Symphony of the Seas ruled as the world’s largest from 2018 to 2022, measuring 228,081 gross tons. This floating resort stretches 1,184 feet and carries up to 5,518 passengers across its 18 decks.
Symphony introduced the Ultimate Abyss, a 10-story dry slide that sends riders plummeting at speeds up to 9 miles per hour.
Harmony of the Seas
When Harmony of the Seas launched in 2016, it became the world’s largest ship and held that distinction for two years. The 226,963-gross-ton vessel measures 1,188 feet long and accommodates 5,479 passengers. Harmony pioneered several features that became standard on later Oasis-class ships, including enhanced entertainment venues and expanded dining options.
Oasis of the Seas
Oasis of the Seas revolutionized the cruise industry when it debuted in 2009, introducing the concept of neighborhoods at sea. At 225,282 gross tons, this ship set a new standard that went unmatched for six years.
The vessel’s innovative design divided the ship into seven themed districts, including the popular Boardwalk with a hand-carved carousel.
Allure of the Seas
As the second Oasis-class ship, Allure of the Seas joined the fleet in 2010 and briefly held the title of world’s largest. Measuring 225,282 gross tons and 1,180 feet long, it’s virtually identical to its sister Oasis.
Allure carries 5,484 passengers and features the signature AquaTheater, an outdoor amphitheater with the deepest pool at sea.
MSC World America
MSC Cruises entered the mega-ship race with MSC World America, which debuted in 2025 at 205,700 gross tons. This vessel stretches 1,094 feet and can accommodate 4,888 passengers across its innovative Y-shaped design.
The ship features the World Galleria, a stunning three-deck promenade with an LED dome that creates immersive visual experiences throughout the day.
MSC World Europa
MSC World Europa became the first of MSC’s World-class ships when it launched in late 2022. At 205,700 gross tons and 1,094 feet long, this LNG-powered vessel represents a significant environmental step forward for the industry.
The ship carries 4,888 passengers and features the Venom Drop @ The Spiral, a thrilling slide that extends over the side of the ship.
Costa Toscana
Costa Cruises’ flagship measures 185,010 gross tons and entered service in 2021. The ship stretches 1,106 feet and can host 5,224 passengers while showcasing designs inspired by Italian cities and regions.
Costa Toscana runs on liquefied natural gas, making it one of the most environmentally advanced ships in the Costa fleet.
Arvia
P&O Cruises’ largest ship ever, Arvia weighs 184,700 gross tons and debuted in December 2022. This 1,132-foot vessel carries 5,206 passengers and features the innovative SkyDome, a retractable glass roof covering a pool area.
The ship caters primarily to the British market with 30 restaurants and bars offering everything from traditional pub fare to international cuisine.
Costa Smeralda
Costa Smeralda became the first ship in Costa’s Excellence class when it launched in 2019, measuring 185,010 gross tons. The 1,106-foot vessel accommodates 5,224 passengers and showcases Italian design throughout its public spaces.
Named after Sardinia’s famous Emerald Coast, the ship features a three-deck promenade designed to resemble a Roman street.
Iona
P&O Cruises launched Iona in 2020 as their first Excellence-class vessel at 184,700 gross tons. The ship measures 1,132 feet long and carries 5,206 passengers while operating primarily around the British Isles and Mediterranean.
Iona was the first ship in the P&O fleet powered by liquefied natural gas, representing a major investment in cleaner technology.
MSC Euribia
MSC Euribia joined the fleet in 2023 as another Meraviglia-Plus class ship weighing 184,011 gross tons. This 1,087-foot vessel can accommodate 4,888 passengers and features striking hull artwork inspired by the sea.
The ship includes the Infinity Atrium, a stunning three-deck space with LED screens creating immersive visual displays.
AIDAnova
AIDA Cruises broke new ground with AIDAnova, which became the world’s first cruise ship powered at sea by liquefied natural gas when it launched in 2018. At 183,858 gross tons and 1,106 feet long, this vessel carries 5,200 passengers.
The ship features a three-story water slide park and extensive family-friendly amenities that set the standard for AIDA’s Excellence class.
AIDAcosma
AIDAcosma became the second Excellence-class ship for AIDA when it entered service in 2021, measuring 183,900 gross tons. The 1,106-foot vessel mirrors many features of its sister AIDAnova while accommodating 5,200 passengers.
Like its predecessor, AIDAcosma runs on LNG fuel and showcases the line’s commitment to environmental innovation.
Floating Cities on the Horizon
The ships sailing today would have seemed impossible just 30 years ago when most cruise vessels barely topped 70,000 gross tons. Royal Caribbean has dominated the ultra-large ship market, operating ten of the seventeen largest vessels currently at sea.
These floating resorts now offer amenities that rival land-based destinations, from full-size theaters and multiple pools to rock climbing walls and surf simulators. The industry shows no signs of slowing down, with several more massive ships already under construction and scheduled for delivery in the coming years, ensuring that the race to build bigger and better continues well into the future.
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