What Are the Biggest Cruise Ships in 2026?

Cruise ships have become more than just a way to travel from one destination to another. Today, they are floating resorts with restaurants, swimming pools, water parks, theaters, shopping areas, sports facilities and entertainment for thousands of people.

In 2026, the world's biggest cruise ships are larger than ever. Most of the largest ships belong to Royal Caribbean, although MSC Cruises and other companies also operate some impressive mega-ships.

But what exactly makes a cruise ship "big"? The most common measurement is gross tonnage (GT). Gross tonnage does not mean the ship's weight. Instead, it measures the total enclosed internal volume of the ship. This makes it a useful way to compare the overall size of large cruise ships. 

Here are some of the biggest cruise ships sailing or entering service in 2026.

1. Icon of the Seas

The Icon of the Seas is one of the biggest cruise ships in the world in 2026. Operated by Royal Caribbean, the ship measures about 248,663 gross tons and is around 365 meters long.

The ship entered service in 2024 and can accommodate more than 5,600 passengers at double occupancy, with its maximum passenger capacity reaching about 7,600. 

Icon of the Seas is designed to feel more like a large holiday resort than a traditional cruise ship. It has several pools, water attractions, restaurants, entertainment areas and different neighborhoods designed for different types of travelers.

One of its biggest attractions is its large waterpark, which includes several waterslides. Families can also find children's activities, while adults have access to restaurants, bars and entertainment spaces.

2. Star of the Seas

Star of the Seas is another giant from Royal Caribbean's Icon Class. It entered service in 2025 and has almost the same size as Icon of the Seas, with approximately 248,663 gross tons. It is about 365 meters long and can accommodate thousands of passengers. 

The ship follows the same basic idea as Icon of the Seas: combine the experience of a cruise with the features of a large resort.

Guests can find multiple pools, restaurants, entertainment venues and family attractions. Because it belongs to the Icon Class, Star of the Seas is built around large open spaces and different areas where passengers can spend their time.

3. Legend of the Seas

Another major addition to the Icon Class is Legend of the Seas, which enters service in 2026. It has the same listed gross tonnage as its Icon Class sister ships, around 248,663 GT. 

Legend of the Seas continues Royal Caribbean's move toward extremely large ships packed with activities. It includes familiar Royal Caribbean restaurants and entertainment options, along with some new dining choices.

With three Icon Class ships now part of the 2026 cruise scene, Royal Caribbean has strengthened its position at the top of the world's cruise-ship size rankings.

4. Utopia of the Seas

The Utopia of the Seas is an Oasis Class ship that entered service in 2024. It measures roughly 236,473 gross tons and is around 362 meters long. 

Although it is smaller than the Icon Class ships, Utopia of the Seas is still enormous. It can accommodate more than 5,600 passengers at double occupancy.

The ship has multiple pools, water slides, restaurants, entertainment venues and outdoor spaces. It is particularly aimed at travelers who enjoy a lively cruise experience.

5. Wonder of the Seas

Wonder of the Seas is another Royal Caribbean giant. It entered service in 2022 and measures around 235,600 to 236,857 gross tons, depending on the source used for the ship's specifications. It is approximately 362 meters long. 

Wonder of the Seas belongs to the Oasis Class, which helped change the idea of what a cruise ship could be.

Instead of having one continuous ship design, Oasis Class vessels are divided into different neighborhoods. This gives passengers a greater choice of places to eat, relax and have fun.

6. Symphony of the Seas

With about 228,081 gross tons, Symphony of the Seas remains one of the largest cruise ships in the world in 2026. 

The ship entered service in 2018 and was one of the largest cruise ships ever built at the time.

It features swimming pools, restaurants, entertainment venues, sports areas and family attractions. Its size allows thousands of passengers to enjoy many different activities without having to leave the ship.

7. Harmony of the Seas

Harmony of the Seas has approximately 226,963 gross tons and is another Oasis Class ship from Royal Caribbean. It entered service in 2016. 

The ship was a major step forward in cruise-ship design when it launched. It offers multiple neighborhoods, restaurants, entertainment areas and outdoor activities.

Even though newer ships have taken the top spots, Harmony of the Seas remains a huge ship by any standard.

8. Oasis of the Seas

The ship that started much of the modern mega-cruise trend is Oasis of the Seas. It entered service in 2009 and has around 226,838 gross tons. 

When Oasis of the Seas was introduced, its size was considered extraordinary. The ship demonstrated that a cruise vessel could contain neighborhoods, large entertainment spaces, gardens and many different activities.

More than 15 years later, it is still one of the world's largest cruise ships.

9. Allure of the Seas

Allure of the Seas is another Oasis Class ship and has roughly 225,000 to 226,000 gross tons, depending on the source. It entered service in 2010. 

Like its sister ships, Allure offers a large selection of restaurants, entertainment, pools and activities.

Its continued place among the world's largest cruise ships shows how impressive the Oasis Class was when it first arrived.

10. MSC World America

Royal Caribbean dominates the top of the list, but MSC World America is an important exception. Operated by MSC Cruises, the ship measures about 216,638 gross tons and entered service in 2025. 

It is one of the largest cruise ships operated by a company outside Royal Caribbean cruises.

MSC World America offers restaurants, entertainment, pools and large outdoor areas. Its size allows MSC Cruises to provide a wide range of experiences on a single ship.

Why Are Cruise Ships Getting So Big?

There are several reasons cruise companies continue to build larger ships.

First, bigger ships can offer more facilities. A modern mega-ship can have dozens of restaurants and bars, several pools, theaters, children's areas, sports facilities and other attractions.

Second, large ships can carry more passengers. This helps cruise companies spread the cost of operating the vessel across a larger number of guests.

Finally, cruise lines are competing to create memorable experiences. Instead of simply offering transportation between ports, today's cruise companies want passengers to enjoy the ship itself as an important part of the vacation.

Final Thoughts

The biggest cruise ships in 2026 are essentially floating cities. The Icon Class ships from Royal Caribbean sit at the top of the size rankings, with Utopia of the Seas and the Oasis Class ships following closely behind. MSC World America is also an important member of the world's mega-ship group. 

For travelers, choosing the biggest ship is not necessarily about finding the best cruise. A huge ship can offer an incredible number of activities, but it can also mean more passengers and a busier atmosphere.