Cruise ships have evolved into floating cities, offering unparalleled luxury, entertainment, and capacity for thousands of passengers. As of mid-2025, these are the top ten largest cruise ships in the world, ranked by maximum passenger capacity, based on data from cruise line publications and authoritative maritime sources. From Royal Caribbean’s massive Icon of the Seas to Costa Cruises’ eco-friendly Costa Smeralda, let’s dive into the giants ruling the seas!
1. Icon of the Seas (Royal Caribbean) – The World’s Largest
- Class: Icon
- Year Launched: 2024
- Gross Tonnage: 248,663 GT
- Length: 364.7 m (1,197 ft)
- Passenger Capacity: 7,600 (max)
Launched in January 2024, Icon of the Seas is the undisputed king of cruise ships, holding the title of the largest by both gross tonnage and passenger capacity. This Icon-class vessel from Royal Caribbean is a marvel of engineering, offering everything from water parks to Broadway-style shows. With space for 7,600 guests, it’s a floating resort that redefines cruising.
2. Utopia of the Seas (Royal Caribbean)
- Class: Oasis
- Year Launched: 2024
- Gross Tonnage: ~236,860 GT
- Length: 362 m (1,188 ft)
- Passenger Capacity: ~6,509 (max)
Hot on the heels of Icon, Utopia of the Seas is Royal Caribbean’s newest Oasis-class ship, launched in 2024. With a gross tonnage of approximately 236,860 and capacity for 6,509 passengers, this mega-ship delivers vibrant entertainment, diverse dining, and innovative amenities for families and thrill-seekers alike.
3. Wonder of the Seas (Royal Caribbean)
- Class: Oasis
- Year Launched: 2022
- Gross Tonnage: 236,857 GT
- Length: 362 m (1,188 ft)
- Passenger Capacity: 6,988 (max)
Another Oasis-class giant, Wonder of the Seas debuted in 2022 and remains a top contender. Boasting a gross tonnage of 236,857 and room for nearly 7,000 passengers, it features neighborhoods like Central Park and the Ultimate Abyss slide, making it a favorite for multi-generational travelers.
4. Allure of the Seas (Royal Caribbean)
- Class: Oasis
- Year Launched: 2010
- Gross Tonnage: 226,637 GT
- Length: 360 m (1,180 ft)
- Passenger Capacity: 6,780 (max)
A pioneer of the Oasis class, Allure of the Seas has been wowing guests since 2010. With a capacity for 6,780 passengers and a tonnage of 226,637 GT, this ship offers a mix of classic and modern amenities, from zip lines to fine dining, proving its enduring appeal.
5. Harmony of the Seas (Royal Caribbean)
- Class: Oasis
- Year Launched: 2016
- Gross Tonnage: 226,963 GT
- Length: 362.1 m (1,188 ft)
- Passenger Capacity: 6,687 (max)
Harmony of the Seas is another Oasis-class icon, launched in 2016. With a gross tonnage of 226,963 and space for 6,687 guests, it’s packed with features like the Bionic Bar and a 10-story dry slide, ensuring non-stop excitement on every voyage.
6. Symphony of the Seas (Royal Caribbean)
- Class: Oasis
- Year Launched: 2018
- Gross Tonnage: 228,081 GT
- Length: 361 m (1,184 ft)
- Passenger Capacity: 6,680 (max)
Royal Caribbean’s Symphony of the Seas (2018) continues to impress with its 228,081 GT and capacity for 6,680 passengers. Highlights include laser tag, a surf simulator, and diverse entertainment options, making it a top choice for adventure-seekers.
7. MSC World America (MSC Cruises)
- Class: World
- Year Launched: 2025
- Gross Tonnage: 216,638 GT
- Length: 333.3 m (1,094 ft)
- Passenger Capacity: 6,762 (max)
MSC Cruises’ MSC World America, launched in 2025, is part of the innovative World class. With a gross tonnage of 216,638 and capacity for 6,762 guests, this ship blends European elegance with modern technology, offering a unique cruising experience.
8. MSC World Europa (MSC Cruises)
- Class: World
- Year Launched: 2022
- Gross Tonnage: 215,863 GT
- Length: 333.3 m (1,094 ft)
- Passenger Capacity: 6,762 (max)
Sister ship to MSC World America, MSC World Europa (2022) matches its capacity of 6,762 passengers and boasts a slightly smaller tonnage of 215,863 GT. Known for its eco-friendly design and luxurious amenities, it’s a standout in MSC’s fleet.
9. Carnival Jubilee (Carnival Cruise Line)
- Class: Excel (Excellence)
- Year Launched: 2023
- Gross Tonnage: 183,521 GT
- Length: 345 m (1,132 ft)
- Passenger Capacity: ~6,600 (max)
Carnival’s Carnival Jubilee (2023) is the latest Excel-class ship, with a gross tonnage of 183,521 and room for approximately 6,600 passengers. Designed for fun, it features roller coasters, water parks, and vibrant nightlife, embodying Carnival’s festive spirit.
10. Costa Smeralda (Costa Cruises)
- Class: Excellence
- Year Launched: 2019
- Gross Tonnage: 185,010 GT
- Length: 337 m (1,106 ft)
- Passenger Capacity: 6,554 (max)
Rounding out the list is Costa Smeralda (2019), an LNG-powered ship in the Excellence class. With a tonnage of 185,010 GT and capacity for 6,554 guests, this Costa Cruises vessel combines sustainability with Italian flair, offering a refined cruising experience.
Why These Ships Matter
These mega-ships, each capable of carrying over 5,000 guests at double occupancy and even more at full capacity, represent the pinnacle of modern cruise engineering. Royal Caribbean dominates with six ships on the list, including the record-breaking Icon of the Seas and its Oasis-class fleet. MSC Cruises makes a strong showing with its World-class vessels, while Carnival and Costa Cruises bring their unique flavors to the rankings with Excel and Excellence-class ships.
Whether you’re seeking adrenaline-pumping activities, eco-conscious cruising, or luxurious relaxation, these top ten ships offer something for every traveler. Ready to set sail? Check with the cruise lines for itineraries and book your adventure on one of these floating giants!
Data sourced from cruise line fact sheets, ship registry records, and authoritative maritime publications as of mid-2025.
