Ranked by gross tonnage, the industry's standard size measure — Royal Caribbean builds nine of the sixteen largest ships afloat.
| Rank | Ship | Gross tonnage | Cruise line |
|---|---|---|---|
| 1 | Icon of the Seas (2024) | 248,663 GT | Royal Caribbean |
| 2 | Star of the Seas (2025) | 248,663 GT | Royal Caribbean |
| 3 | Legend of the Seas (2026) | 248,663 GT | Royal Caribbean |
| 4 | Utopia of the Seas (2024) | 236,473 GT | Royal Caribbean |
| 5 | Wonder of the Seas (2022) | 235,600 GT | Royal Caribbean |
| 6 | Symphony of the Seas (2018) | 228,081 GT | Royal Caribbean |
| 7 | Harmony of the Seas (2016) | 226,963 GT | Royal Caribbean |
| 8 | Oasis of the Seas (2009) | 226,838 GT | Royal Caribbean |
| 9 | Allure of the Seas (2010) | 225,282 GT | Royal Caribbean |
| 10 | MSC World America (2025) | 216,638 GT | MSC |
| 11 | MSC World Europa (2022) | 215,863 GT | MSC |
| 12 | Costa Smeralda (2019) | 185,010 GT | Costa |
| 13 | Carnival Celebration (2022) | 185,010 GT | Carnival |
| 14 | Arvia (2022) | 184,700 GT | P&O |
| 15 | Iona (2020) | 184,089 GT | P&O |
| 16 | AIDAnova (2018) | 183,858 GT | AIDA |
No matching rows.
The first Icon-class ship, debuting in January 2024 as the largest cruise ship ever built. Its headline feature is Category 6, the largest waterpark at sea, with six water slides across seven decks — plus a capacity of up to 7,600 passengers at full occupancy.[1]
Icon of the Seas' sister ship, named in August 2025 and sailing year-round from Port Canaveral, Florida. Built to the identical Icon-class specification, it ties for the title of the world's largest cruise ship rather than surpassing it.[2]
The third and newest Icon-class ship, debuting in summer 2026. Like its two sisters it shares the same gross tonnage, so the "world's largest" title is currently a three-way tie decided by launch order rather than size.[3]
An Oasis-class ship built specifically for short getaways — 3-night weekend and 4-night weekday sailings out of Florida — rather than the week-plus itineraries most mega-ships run, packing a full-size cruise ship's worth of attractions into a much shorter trip.[4]
Held the title of world's largest cruise ship from its 2022 debut until Icon of the Seas launched in 2024. It's the fifth and final ship of the Oasis class, the design family that first broke the 200,000-gross-ton barrier back in 2009.[5]