The cruise industry has experienced remarkable growth over the past decade, transforming global tourism and making a significant impact on the global economy. The cruise industry has markedly picked up speed after taking a major hit during the COVID-19 pandemic. According to the Cruise Lines International Association (CLIA), about 35.7 million passengers are expected to have set sail in 2024, 6 percent more than in 2019. J.P. Morgan Research estimates the cruise industry will capture around 3.8 percent of the $1.9 trillion global vacation market by 2028.
As more travelers seek immersive, all-inclusive experiences, cruise lines have responded by launching larger, more advanced ships designed to cater to every need. This expansion has not only boosted international travel but has also driven economic growth in port cities, creating jobs and fostering local businesses.
At the forefront of this evolution is the rise of mega cruise ships—floating cities that redefine luxury travel. These vessels are no longer just about transportation; they offer a mix of high-end accommodations, world-class dining and entertainment. From sky-high observation decks to water parks and AI-powered concierge services, today’s mega-ships are setting new standards for leisure and hospitality.
Royal Caribbean International: A mega cruise ship leader
Royal Caribbean International is part of Royal Caribbean Group. The company has been in the cruise industry for more than 50 years, offering game-changing ships and private destinations that revolutionize vacations with innovations and an all-encompassing combination of experiences. The cruise line was voted “Best Cruise Line Overall” for 22 consecutive years in the Travel Weekly Readers Choice Awards. It sails across more than 300 destinations in 80 countries on all seven continents, including top-rated private destinations.
As one of the most recognized names in cruising, the company has built a reputation for delivering unparalleled experiences, pioneering new technologies, and launching some of the largest and most advanced vessels in the world.
At the heart of Royal Caribbean’s dominance is its commitment to innovation in cruise ship design and onboard experiences. From the introduction of game-changing attractions like skydiving simulators and robotic bartenders to industry-first neighborhoods and smart staterooms, Royal Caribbean continues to set the standard for modern cruising. Its ships are more than just a means of travel—they are destinations in themselves, offering world-class entertainment, gourmet dining and immersive activities that appeal to travelers of all ages.
The company’s ambitious fleet expansion further cements its leadership in the industry. With the launch of next-generation vessels, including the highly anticipated Icon Class vessels, and new destinations around the world, Royal Caribbean is introducing ships that are bigger, smarter and more sustainable than ever before.
10 largest cruise ships in the world
Dominating the list of the 10 largest cruise ships in the world is Royal Caribbean International. The list includes:
1. Icon of the Seas: 248,663 gross tons
Coming in at 248,663 gross tons and measuring 365 meters, the Royal Caribbean International’s Icon of the Seas is the largest cruise ship in the world. Launched in January 2024, the Icon has a total capacity of 7,600 passengers and 2,350 crew across 20 decks.
The ship includes 13 restaurants, 14 specialty venues and 18 bars. It also houses a spa, a mini-golf course, the AquaTheatre, an escape room, a climbing wall and much more.
Icon of the Seas is the lead ship in the new Icon-class, with a sister ship the Star of the Seas due to be delivered in 2025 and another ship planned for delivery in 2026.
2. Wonder of the Seas: 235,600 gross tons
Royal Caribbean’s Wonder of the Seas is the second-largest cruise ship in the world and the fifth Oasis-class cruise ship built for the cruise line. Weighing 235,600 gross tons, the Wonder of the Seas was the largest ship in the world when it was completed in January 2022. Measuring 362 meters, the 18-deck ship has a maximum capacity of 7,084 guests across its 2,867 staterooms, as well as 2,369 crew.
Wonder of the Seas is the first to bring eight unique neighborhoods to the epic Oasis Class, including the luxurious Suite Neighborhood.
3. Symphony of the Seas: 228,081 gross tons
In its launch in 2018, the Symphony of the Seas surpassed the Harmony as the largest cruise ship in the world, weighing in at 228,081 gross tons. The ship extends 361 meters and has a maximum capacity of 6,680 passengers and 2,200 staff across 18 decks.
The ship was the testing ground for Royal Caribbean’s new muster drill. Entertainment is a major highlight onboard the Symphony of the Seas, with an outdoor amphitheater, ice-skating shows and a Broadway-style production of Hairspray.
It also features the Ultimate Abyss slide and the Royal Promenade which buzzes with live music and pop-up performances. There are 20 dining options, eight of which are included in the base fare, and 13 bars.
4. Harmony of the Seas: 226,963 gross tons
The Harmony of the Seas is the third Oasis-class ship built by Royal Caribbean, weighing in bigger than its existing sister ships at launch in 2016 at 226,963 gross tons. With a total length of 362 meters, Harmony of the Seas has a maximum capacity of 6,780 passengers and 2,300 staff across 18 decks.
The ship’s Central Park, an open-air space with real trees and winding paths, offers a quieter escape from the action-packed decks. The Boardwalk is another notable feature, with a carousel and aqua shows.
5. Oasis of the Seas: 226,838 gross tons
Royal Caribbean’s Oasis of the Seas set the standard for modern mega-ships when it launched in 2009. The ship launched the concept of neighborhoods, which many lines have adopted since.
The oldest ship on this list, the Oasis of the Seas has been in service for over a decade. It was the largest cruise ship in the world at the time when it launched in 2009, with a gross tonnage of 226,838 and a length of 360 meters. The Oasis of the Seas has a maximum capacity of 6,699 passengers and 2,181 staff across 18 decks.
Entertainment is a strong point, with a surf simulator, rock-climbing walls and aerial performances at the AquaTheater. Oasis of the Seas retained the title of Biggest Ship at Sea for over six years until Harmony of the Seas debuted.
6. Allure of the Seas: 225,282 gross tons
Royal Caribbean’s Allure of the Seas is the sixth-largest cruise ship in the world. Allure of the Seas weighs in at 225,282 gross tons and measures 362 meters, only 50mm longer than its sister ship the Oasis of the Seas. The Allure has a maximum capacity of 6,780 passengers and 2,200 crew across 18 decks.
The ship follows the familiar formula of its sister ships in the class but has a few unique features, including its own Broadway show and a range of family-friendly activities.
7. MSC World Europa: 215,863 gross tons
The only entry in the top ten largest cruise ships from MSC Cruises, MSC World Europa measures 333 meters in length. Coming in at 215,863 gross tons, the ship can house more people than any other ship in the MSC fleet, up to 6,762 passengers across 2,633 cabins spread over 22 decks, in addition to 2,138 crew.
The MSC World Europa launched at the end of 2021 and was initially used as an accommodation vessel for fans attending the 2022 FIFA World Cup in Qatar. Following the competition, the ship traveled several routes around the UAE, before sailing to the Mediterranean, where it has sailed itineraries since.
MSC World Europa has a futuristic look and emphasizes sustainability as it is powered by liquefied natural gas. The ship’s centerpiece is the Venom Drop – a spiraling dry slide.
8. Costa Toscana: 186,364 gross tons
Costa Cruises’ Costa Toscana is the sister ship of the Costa Smeralda and is also powered by LNG. Measuring 337 meters long and weighing 186,364 gross tons, the Toscana has a maximum capacity of 6,338 passengers and 1,678 staff across its 20 decks.
Launched in March 2022, Costa Toscana is Costa Cruises’ take on the new generation of mega-ships and the eighth-largest cruise ship in the world. Named after the Tuscany region of Italy, Costa Toscana mainly sails around the Mediterranean Sea but has also sailed to Brazil and the UAE.
9. Costa Smeralda: 185,010 gross tons
In 9th place comes the Costa Smeralda, the first LNG-powered vessel in the Costa Cruises fleet. With a gross tonnage of 185,010, the 20-deck Excellence-class ship measures 337 meters in length. The second LNG-powered cruise ship to enter operation in the world, it has a maximum capacity of 6,554 passengers with 1,646 crew and a service speed of 21.5 knots, making it the 9th largest cruise ship in the world.
10. P&O Cruises MS Arvia: 185,581 gross tons
The tenth largest cruise ship in the world is the MS Arvia, P&O Cruises’ fourth ship to be built by German shipyard Meyer Werft. Weighing in at 185,581 gross tons, the 345-meter Arvia is slightly larger than its sister ship, the MS Iona.
The 20-deck ship is the largest ship commissioned for the British cruise market and has a maximum passenger capacity of 6,264 passengers, with 1,800 crew onboard. The ship is the second liquefied natural gas (LNG)-powered Excellence-class vessel for P&O, following the Iona. After launching in August 2022, the Arvia mainly operates itineraries around the Caribbean or the Mediterranean.
The largest ship in the P&O Cruises fleet, Arvia has 30 restaurants and bars, eight entertainment venues and four pools. The ship’s SkyDome, a large pool area with a retractable glass roof, provides a weather-proof space for daytime lounging and evening entertainment. Arvia is a decidedly family-friendly ship with kids’ clubs, splash zones, interactive games and more.
Upcoming changes to the top 10 largest cruise ships in the world
Two new ships launching this year will shake up rankings this year. Arriving in summer 2025, the Star of the Seas will weigh 248,663 gross tons and extend at a length of 364 meters. It will have a guest capacity of 5,610 and a crew capacity of 2,350. Star of the Seas will become the joint biggest ship in the world, sharing the title with Icon of the Seas, when it launches later this year.
Another mega cruise ship launching this year is the MSC World America, coming in at 205,700 gross tons. The ship is 333 meters long and has a guest capacity of 6,764 and a cruise capacity of 2,138.
MSC World America promises a world of unexpected dining experiences in original locations. With a choice of 6 specialty dining venues, a selection of 7 complimentary restaurants, and 18 bars, cafés and lounges, guests have the opportunity to explore a variety of different culinary traditions, creating an unforgettable gastronomic journey.
MSC World America will come in behind sister-ship MSC World Europe in the rankings. MSC World America and Star of the Seas will push Costa Toscana and Arvia out of the top 10, leaving Royal Caribbean and MSC Cruises with full control of the top 10 largest cruise ships in the world.
What to expect aboard the largest cruise ships
Unparalleled luxury and comfort
The largest cruise ships in the world redefine luxury, offering guests an experience that rivals the finest resorts. Spacious suites with private balconies provide breathtaking ocean views, elegant furnishings and exclusive services like priority boarding and dedicated concierge assistance. High-end amenities such as king-sized beds, spa-inspired bathrooms and personalized in-room dining elevate the experience, while some suites even feature private whirlpools or multi-level layouts for ultimate comfort.
Beyond lavish accommodations, these ships incorporate smart technology for a seamless onboard experience. Guests can control lighting, temperature, and entertainment systems through in-room touchscreens or mobile apps. AI-powered virtual assistants handle requests, from dinner reservations to activity bookings, while keyless entry and facial recognition speed up embarkation and onboard purchases.
World-class dining and culinary experiences
Aboard the largest cruise ships in the world, travelers can find diverse dining options. They can indulge in Michelin-star and themed restaurants, where famous chefs craft unique menus. To cater to every traveler, mega cruise ships provide global cuisines that fit diverse palates, including halal, kosher, vegetarian and vegan selections.
Many ships also offer interactive dining experiences, such as cooking classes and chef’s table events, allowing food enthusiasts to engage with the culinary process.
Entertainment and recreational activities
The largest cruise ships in the world offer a variety of entertainment experiences, ensuring there’s never a dull moment at sea. Guests can usually enjoy Broadway-style performances, featuring world-class productions with dazzling choreography and live orchestras.
For thrill-seekers, these mega-ships include adventure parks, surf simulators and state-of-the-art fitness centers. Attractions also include zip lines, skydiving simulators and even roller coasters that loop over the ocean. Surf simulators let guests ride the waves, while multi-level water parks feature towering slides and lazy rivers.
Exclusive business and networking opportunities
Mega cruise ships are not just for leisure—they also serve as venues for corporate events and professional gatherings. Conference halls and meeting rooms are equipped with state-of-the-art technology, including high-speed Wi-Fi, video conferencing capabilities and customizable seating arrangements, making them ideal for corporate retreats and seminars. With dedicated event planners on board, businesses can host everything from product launches to leadership summits in a setting that blends productivity with luxury.
For business travelers seeking a more refined atmosphere, private lounges and executive experiences provide exclusive spaces for networking and relaxation. These VIP areas offer quiet workspaces, complimentary refreshments and concierge services, ensuring a seamless work-life balance while at sea.
The future of mega cruise ships: Trends and innovations
As the cruise industry continues to expand, the next generation of mega cruise ships is set to revolutionize travel with cutting-edge advancements in sustainability, technology and onboard experiences.
A major focus for the largest cruise ships in the world is sustainability, with companies investing in LNG-powered ships and carbon-neutral initiatives to reduce their environmental footprint. LNG significantly lowers emissions, while innovative waste management systems and energy-efficient designs contribute to greener operations. Some cruise lines are also exploring hybrid propulsion and alternative fuels to achieve net-zero emissions in the coming decades.
Technology is also transforming cruising with AI-driven personalization and enhanced customer experiences. Smart cabins adjust lighting and temperature based on guest preferences, while AI-powered assistants streamline everything from dining reservations to excursion planning. Facial recognition and wearable tech improve security and convenience, creating a seamless and stress-free journey.
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FAQs about the largest cruise ships in the world
What makes Icon of the Seas different from other cruise ships?
Coming in at 248,663 gross tons and measuring 365 meters, the Royal Caribbean International’s Icon of the Seas is the largest cruise ship in the world. Launched in January 2024, the Icon has a total capacity of 7,600 passengers and 2,350 crew across 20 decks.
How does Royal Caribbean maintain sustainability in its new fleet?
Royal Caribbean is introducing LNG-powered ships, such as those in the Icon Class, which significantly reduce greenhouse gas emissions. LNG burns cleaner than traditional marine fuels, cutting sulfur emissions by nearly 100 percent, nitrogen oxide emissions by 85 percent, and carbon dioxide emissions by around 20 percent.
The cruise line has also developed state-of-the-art waste management systems, including waste-to-energy conversion, advanced water treatment facilities and zero-landfill policies on new ships. These systems ensure that waste is processed efficiently and sustainably while minimizing pollution.
How do business travelers benefit from mega cruise ships?
Mega cruise ships feature fully equipped conference halls, private meeting rooms, and business lounges, complete with high-speed Wi-Fi, video conferencing, and presentation technology. These facilities make ships ideal for corporate retreats, industry conventions, and executive summits.
Unlike traditional business settings, cruise ships offer casual yet sophisticated networking opportunities. Whether at exclusive cocktail receptions, private lounges, or specialty dining venues, business travelers can build connections in a stress-free, luxurious setting.
Companies use mega cruise ships for incentive travel programs, rewarding top performers with luxury experiences. Onboard activities like zip-lining, escape rooms, and wellness retreats foster team bonding in a unique and engaging way.
What exclusive onboard experiences are available for high-net-worth individuals?
Luxury cruise lines cater to high-net-worth individuals (HNWIs) with bespoke services, private spaces, and ultra-premium experiences designed for exclusivity and comfort. HNWIs can enjoy lavish multi-level suites with private terraces, infinity pools, and 24/7 butler service. Some luxury cruise lines offer shipboard residences, granting owners VIP privileges, exclusive dining, and access to members-only areas.
Mega cruise ships also feature VIP-only lounges, sundecks, and pools, providing a serene escape from the crowds. Areas like The Haven on Norwegian Cruise Line or MSC Yacht Club offer secluded luxury with personal concierge services.
HNWIs can also indulge in exclusive chef’s table experiences, private wine tastings, and gourmet dining curated by Michelin-star chefs. Some ships offer in-suite fine dining with custom menus tailored to personal preferences.
