World’s Biggest Cruise Ships Through the Decades: 1970s - 2020s

Cruise ships have undergone an extraordinary transformation over the past half-century. In the 1970s, some of the world's largest passenger vessels were former ocean liners adapted for cruising.

By the 1980s, purpose-built mega-cruise ships were beginning to appear. Then came enormous vessels with shopping promenades, ice-skating rinks, water parks, theatres and entire "neighbourhoods" onboard.

The growth has been remarkable: from ships of roughly 70,000 gross tons in the 1970s to today's giants approaching 250,000 gross tons.

Here's a decade-by-decade look at some of the ships that held the title of the world's largest cruise ship.

The 1970s: The Era of the Ocean Liner

​At the beginning of the 1970s, the cruise industry looked very different from today. Huge purpose-built cruise ships were not yet common, and traditional ocean liners still dominated the world's passenger shipping scene. One of the most important ships of the era was SS France, which entered service in 1962. At approximately 66,343 gross tons, it was one of the largest passenger ships still operating in the early 1970s.

​When the France was retired from French service, Norwegian Caribbean Line acquired the vessel. After an extensive conversion, it returned to service in 1980 as SS Norway, becoming an important bridge between the traditional ocean-liner era and the modern cruise-ship era.

The ship's story is significant because it demonstrated that enormous passenger vessels could be given a second life as dedicated cruise ships.
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The 1980s: The First Mega-Cruise Ships

​The 1980s marked a major turning point.

In 1987, Royal Caribbean introduced Sovereign of the Seas, a ship that helped establish the concept of the modern cruise mega-ship. At about 73,192 gross tons, it became the world's largest passenger ship when it entered service.

But size wasn't its only innovation.

Sovereign of the Seas featured a dramatic multi-story atrium, extensive pool areas, restaurants and entertainment spaces. It was designed specifically around the idea that the ship itself was part of the holiday.

It could accommodate around 2,600 passengers, a remarkable number for the period.

This was the beginning of a trend that would define the next several decades: cruise lines increasingly competed not just over destinations, but over the size and attractions of their ships.
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​The 1990s: The Birth of the Mega-Ship

The 1990s saw cruise ships grow dramatically.

A major milestone came in 1996 with the arrival of Carnival Destiny. At more than 101,000 gross tons, it became the first cruise ship to exceed the 100,000-GT mark. That was a symbolic moment. Cruise ships had entered the mega-ship era.

​Just two years later, Grand Princess raised the bar again. Entering service in 1998, the ship measured around 109,000 gross tons and briefly became the world's largest cruise ship.

But the record wouldn't last long. In 1999, Royal Caribbean introduced Voyager of the Seas, which was dramatically larger at approximately 137,276 gross tons. It also introduced features that would become synonymous with modern cruising, including an ice-skating rink and rock-climbing wall.

The race to build larger ships was accelerating rapidly.
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The 2000s: Cruise Ships Become Floating Resorts

The first decade of the 21st century produced some enormous leaps in cruise-ship size.

Entering service in 2000, Explorer of the Seas was slightly larger than its sister ship Voyager of the Seas, at around 137,308 gross tons. It held the size record until 2002.

Then came Navigator of the Seas in 2002, pushing the figure to roughly 139,000 gross tons.

In 2003, the famous Queen Mary 2 entered service. Unlike the giant resort-style cruise ships emerging from Royal Caribbean, Queen Mary 2 was an ocean liner, designed for transatlantic crossings as well as cruises. At 148,528 gross tons, she became the world's largest passenger ship when she entered service.

Only a few years later, Royal Caribbean's Freedom of the Seas arrived. Entering service in 2006, it measured around 154,407 gross tons and could carry thousands of passengers. Its enormous size allowed Royal Caribbean to add more entertainment, restaurants, pools and recreational facilities.

The cruise ship was no longer simply transportation between ports. It was becoming a destination in its own right.
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The 2010s: The Age of Floating Cities

If the 2000s produced mega-ships, the 2010s produced floating cities.

The biggest leap came in 2009, when Royal Caribbean introduced Oasis of the Seas. At approximately 225,282 gross tons, it was dramatically larger than the previous record-holder. It was about 360 metres long and could accommodate thousands of passengers.

Oasis of the Seas was divided into distinct onboard neighbourhoods, including areas inspired by a city park and a seaside boardwalk. The idea was revolutionary: instead of simply making a ship bigger, designers could use that additional space to create completely different environments onboard.

In 2016, Harmony of the Seas became the largest cruise ship in the world, measuring around 226,963 gross tons. This was followed by the ever larger Symphony of the Seas in 2018. At approximately 228,081 gross tons, it represented another step in the extraordinary growth of cruise ships.

By the end of the 2010s, the largest cruise ships were more than three times the gross tonnage of Sovereign of the Seas from the late 1980s.
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The 2020s: The World's Biggest Cruise Ships Yet

The 2020s have taken the mega-ship concept to another level.

Royal Caribbean's Wonder of the Seas entered service in 2022. At around 235,600 gross tons, it surpassed the previous Oasis-class record holders. It could accommodate nearly 7,000 passengers at maximum capacity.

But once again, the record didn't last long. In 2024, Royal Caribbean's Icon of the Seas entered service. With a gross tonnage of approximately 248,663, it became one of the largest cruise ships ever built and pushed passenger capacity to around 7,600 guests at maximum occupancy.

The ship combines features that would have seemed almost unimaginable on a cruise ship in the 1970s: enormous water attractions, multiple pools, numerous restaurants and bars, entertainment venues and different onboard neighbourhoods.

And the evolution hasn't stopped. Royal Caribbean's Icon-class ships such as Star of the Seas have continued the trend, with ships around the same 248,663-GT range. In 2026 Legend of the Seas launched, taking the title of world's largest cruise ship at 250,800 gross tons.