Overview and Answer-First Summary
As of the latest publicly available delivery and registration data, the second largest cruise ship in the world is usually one of the Oasis-class vessels operated by Royal Caribbean International, typically Oasis of the Seas’ sister ship Allure of the Seas. In rare contexts, a sister vessel or a near-peer from another class may temporarily hold this rank depending on new deliveries or conversions. This article explains the basis for that ranking, verifies key metrics, and compares the top ships by gross tonnage and length to clarify how the title is determined and how it may change over time.
How Cruise Ship Size Is Measured and Ranked
Two main metrics determine which ship is “largest” or “second largest”: gross tonnage (GT) and physical length. Gross tonnage reflects the ship’s internal volume and is the primary basis for official rankings by industry authorities such as Lloyd’s Register and DNV GL. Length overall (LOA) matters for ports and itineraries but does not always align with tonnage rank. Because new ships enter service and older ships are retired or modified, the title of second largest can shift. Understanding these metrics helps avoid confusion when reports conflict.
Key Terms Defined
- Gross Tonnage (GT): A volumetric measure of a ship’s internal capacity, not weight; higher GT usually means larger ship.
- Length Overall (LOA): The greatest length of the ship from bow to stern, often used for berth and canal restrictions.
- Class Society: An accredited organization (e.g., Lloyd’s Register, DNV GL) that certifies ship construction and ongoing seaworthiness.
Comparison of the Top Ships by Gross Tonnage
The following table summarizes the most up-to-date, widely reported figures for the world’s largest and second largest cruise ships by gross tonnage as of available delivery records. Exact rankings can shift when new vessels are delivered or after major refurbishments that change tonnage.
| Rank | Ship Name | Class | Operator | Gross Tonnage (GT) | Length Overall (m) |
|---|---|---|---|---|---|
| 1 | Symphony of the Seas | Oasis | Royal Caribbean International | 228,081 | 362 |
| 2 | Allure of the Seas | Oasis | Royal Caribbean International | 225,282 | 362 |
| 3 | Harmony of the Seas | Oasis | Royal Caribbean International | 226,963 | 362 |
| 4 | Oasis of the Seas | Oasis | Royal Caribbean International | 225,282 | 362 |
| 5 | Icon of the Seas | Icon | Royal Caribbean International | 248,663 | 364 |
Note: Totals are rounded to the nearest ton where needed. Icon of the Seas recently entered service with the largest GT, but rankings in practice depend on the date of measurement and whether recently delivered ships have been fully tonnage-verified by class societies.
Spotlight on Allure of the Seas: Current Second-Largest by Common Reports
Allure of the Seas, an Oasis-class vessel delivered in 2010, long held the title of second largest cruise ship by gross tonnage behind Symphony of the Seas. It operates 16 passenger decks, features a Central Park and Boardwalk neighborhood, and accommodates approximately 6,286 passengers at double occupancy. Its tonnage and dimensions are well documented in class society publications, making it a reliable reference point for this rank in most enduring comparisons.
Key Specifications at a Glance
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Ship Name | Allure of the Seas | Publicly reported |
| Class | d>Oasis-classClass society notation | |
| Operator | Royal Caribbean International | Company fleet list |
| GT | 225,282 | Class society data |
| LOA | 362 | Published specifications |
| Year Delivered | 2010 | Historical delivery records |
| Passenger Capacity (double occ.) | Approx. 6,286 | Operator data |
Operational Context and Itinerary Implications
Size influences where a ship can call and how it is operated. Allure of the Seas, like other Oasis-class vessels, typically serves itineraries from North American homeports, including Port Canaveral and Miami, calling to the Caribbean and Bahamas. Its draft, beam, and air draft are aligned with major terminals but may restrict access to smaller or older ports. When ranking by length, Oasis-class ships are also among the longest passenger vessels, which can affect marina choices and transit planning.
Other Ships That May Temporarily Hold Second-Largest Status
Several near-peer ships can claim second place depending on the metric and timing. For gross tonnage, Harmony of the Seas has briefly surpassed Allure on some lists after delivery and verification. Newer Icon-class vessels, notably Icon of the Seas, now exceed both in GT upon entry, reshaping the top ranks. Additionally, certain retrofit conversions or special classifications can shift positions. Unless a new delivery or measurement revision is formally announced by class and operator, Allure of the Seas remains the widely cited second largest by the most consistently applied metrics.
How to Keep This Information Up to Date
Cruise ship rankings evolve with new deliveries, verifications, and occasional retrofits. To stay current, consult primary sources such as class society registers, operator fleet pages, and reputable maritime databases. When evaluating claims about the second largest ship, check the date of the data, the metric used (GT vs. GT+), and whether the vessel is currently in active service. These steps help clarify transient noise from durable facts.
Summary and Key Takeaways
- The second largest cruise ship is most commonly identified as Allure of the Seas by gross tonnage among currently operating vessels.
- Ships are ranked by gross tonnage first; length matters for infrastructure and itineraries but does not always match tonnage rank.
- Class societies and operator fleet lists are authoritative sources for verified specifications.
- Newer deliveries can change the ranking; always check dates and measurement methodology.
- Infrastructure limitations such as draft and air draft are practical considerations tied to ship size.