Ships & Fleets

The 30 Largest Cruise Ships in the World, Ranked by Size

Every few months somebody tells me a new ship is "the biggest in the world," and they're right for about six months before the next one launches. Cruise lines love that headline, and honestly, they've earned it — a modern mega-ship is a genuinely absurd feat of engineering. So here's the real list: the 30 largest cruise ships sailing (or about to sail) in 2026, ranked by size and checked against at least two sources per ship, because I found three different "official" tonnage figures for more than one of these while researching this.

Quick housekeeping before the list: "biggest" here means gross tonnage (GT) — a measure of a ship's total enclosed interior volume, not its weight. It's the number the industry ranks ships by, which is also why two sister ships that look identical from the dock can be 1,000 GT apart. Passenger figures below are double occupancy (every cabin filled with two guests) unless noted — the flashier "max capacity" number you'll see elsewhere counts every pull-out sofa and third berth too.

The top 10, at a glance

RankShipLineGross tonnageYearMy Score
1Icon of the SeasRoyal Caribbean248,66320244.3
2Star of the SeasRoyal Caribbean248,66320254.5
3Legend of the SeasRoyal Caribbean248,6632026Too soon to tell
4Utopia of the SeasRoyal Caribbean236,47320244.4
5Wonder of the SeasRoyal Caribbean235,60020224.2
6Symphony of the SeasRoyal Caribbean228,08120184.3
7Harmony of the SeasRoyal Caribbean226,96320164.3
8Oasis of the SeasRoyal Caribbean226,83820094.2
9Allure of the SeasRoyal Caribbean225,28220104.3
10MSC World AmericaMSC Cruises216,63820253.8

1-3: Royal Caribbean's Icon class — the current heavyweights

Royal Caribbean owns the top three spots outright, and they're basically triplets: same class, same tonnage on paper, three different ships.

  1. Icon of the Seas (Royal Caribbean) My Score 4.3
    248,663 GT, 5,610 guests double occupancy, delivered 2024. First Royal Caribbean ship built to run on LNG, and home to the Aquadome, a glass-domed performance venue that also holds the tallest waterslide and largest waterpark at sea.
  2. Star of the Seas (Royal Caribbean) My Score 4.5
    248,663 GT, 5,610 guests, delivered 2025. Icon's sister ship, with its own version of the Category 6 waterpark and a redesigned Surfside neighborhood built around families.
  3. Legend of the Seas (Royal Caribbean) My Score Too soon to tell
    248,663 GT, 5,610 guests, delivered 2026. The newest of the three, delivered in June 2026 and spending her first season in the Mediterranean before settling into year-round Caribbean sailings from Port Everglades.

4-9: Royal Caribbean's Oasis class — still the backbone of the "biggest ship" conversation

Before Icon existed, Oasis class was the biggest-ship conversation, and six of them still rank in the top 10 more than fifteen years after the first one launched.

  1. Utopia of the Seas (Royal Caribbean) My Score 4.4
    236,473 GT, 5,668 guests, delivered 2024. The first Oasis-class ship to run on LNG, and built around short 3- and 4-night Caribbean getaways rather than week-long cruises.
  2. Wonder of the Seas (Royal Caribbean) My Score 4.2
    235,600 GT, 5,734 guests, delivered 2022. Added an eighth neighborhood — the Suite Neighbourhood — with its own pool deck and ten whirlpools reserved for suite guests.
  3. Symphony of the Seas (Royal Caribbean) My Score 4.3
    228,081 GT, 5,518 guests, delivered 2018. Home to the Ultimate Abyss, a 10-story dry slide that drops from the top deck through the middle of the ship.
  4. Harmony of the Seas (Royal Caribbean) My Score 4.3
    226,963 GT, 5,494 guests, delivered 2016. Introduced the Perfect Storm waterslide trio and the robotic Bionic Bar, where mechanical arms mix your drink.
  5. Oasis of the Seas (Royal Caribbean) My Score 4.2
    226,838 GT, 5,484 guests, delivered 2009. The ship that started it — pioneered the "neighborhood" layout (Central Park, Boardwalk, and so on) that basically every mega-ship since has copied in some form.
  6. Allure of the Seas (Royal Caribbean) My Score 4.3
    225,282 GT, 5,484 guests, delivered 2010. Built 50 millimeters longer than twin sister Oasis of the Seas — reportedly on purpose, so Royal Caribbean could briefly call it the largest ship in the world.

10-12: MSC's World class and Disney's newest ship

  1. MSC World America (MSC Cruises) My Score 3.8
    216,638 GT, 6,762 guests, delivered 2025. MSC's first ship purpose-built for the US market, with the Cliffhanger over-water swing and an Eataly at Sea food hall.
  2. MSC World Europa (MSC Cruises) My Score 3.4
    215,863 GT, 6,762 guests, delivered 2022. A genuine engineering first, not just marketing: the first ship in the world to pair LNG propulsion with a solid oxide fuel cell.
  3. Disney Adventure (Disney Cruise Line) My Score Too soon to tell
    208,108 GT, 4,222 guests double occupancy, delivered 2026. No home-port itinerary at all — she sails round-trip from Singapore as a floating destination in her own right, and she's the first four-funnel ocean liner built since the 1914 RMS Aquitania.

13-22: The Carnival Corp shipbuilding family, plus one MSC ship along for the ride

This cluster is almost entirely Carnival Corporation's four brands — Costa, P&O, AIDA, and Carnival — building off a shared "Excellence-class" hull design. MSC Euribia sneaks in at #17 purely on tonnage.

  1. Costa Toscana (Costa Cruises) My Score 3.0
    186,364 GT, 5,224 guests, delivered 2022. The largest ship ever built for Costa.
  2. Arvia (P&O Cruises) My Score 3.2
    185,581 GT, 5,200 guests, delivered 2022. Britain's biggest cruise ship, built around the SkyDome — an indoor pool and lounge under a retractable glass roof, which makes a lot of sense once you've sailed the North Atlantic in October.
  3. Costa Smeralda (Costa Cruises) My Score 3.0
    185,010 GT, 5,224 guests, delivered 2019. The second cruise ship in the world (after AIDAnova) fully powered by LNG.
  4. Iona (P&O Cruises) My Score 3.6
    184,089 GT, 5,206 guests, delivered 2020. P&O's first LNG-powered ship, and the largest ever built specifically for the British market at the time she launched.
  5. MSC Euribia (MSC Cruises) My Score 3.6
    184,011 GT, 4,816 guests, delivered 2023. MSC's second LNG-powered ship, delivered with the line's carbon-neutral certification covering her first two years of sailing.
  6. AIDAnova (AIDA Cruises) My Score —
    183,858 GT, 5,252 guests, delivered 2018. The actual world's-first here: the first cruise ship ever built that can run entirely on LNG, not a hybrid setup.
  7. AIDAcosma (AIDA Cruises) My Score —
    183,774 GT, 5,228 guests, delivered 2021. AIDAnova's near-identical sister ship, and AIDA's second LNG-powered mega-ship.
  8. Carnival Celebration (Carnival Cruise Line) My Score 4.0
    183,521 GT, 5,374 guests, delivered 2022. Home to BOLT, the world's second roller coaster at sea, and The Golden Jubilee bar, commemorating Carnival's 50th anniversary.
  9. Carnival Jubilee (Carnival Cruise Line) My Score 4.1
    182,015 GT, 5,228 guests, delivered 2023. The third Excel-class ship, and the first one built in Germany (Meyer Werft) instead of Finland.
  10. Mardi Gras (Carnival Cruise Line) My Score 4.1
    181,808 GT, 5,282 guests, delivered 2020. The lead Excel-class ship, and home to the original BOLT — the world's first roller coaster at sea.

23-30: MSC and Princess round out the top 30

  1. MSC Grandiosa (MSC Cruises) My Score 3.6
    181,541 GT, 4,842 guests, delivered 2019. First MSC ship fitted with a closed-loop exhaust scrubber cutting sulfur emissions by 97%.
  2. MSC Virtuosa (MSC Cruises) My Score 3.3
    181,541 GT, 4,842 guests, delivered 2021. Grandiosa's sister ship, based mainly across Northern Europe and the Mediterranean.
  3. Sun Princess (Princess Cruises) My Score 3.5
    177,882 GT, 4,300 guests, delivered 2024. Princess Cruises' largest ship ever, and the line's first powered by LNG.
  4. Star Princess (Princess Cruises) My Score 3.8
    177,800 GT, 4,300 guests, delivered 2025. Sun Princess's sister ship, built at Fincantieri's Monfalcone yard in Italy.
  5. MSC Meraviglia (MSC Cruises) My Score 3.5
    171,598 GT, 4,488 guests, delivered 2017. Its interior promenade runs the length of the ship under a giant LED-panel ceiling that shifts scenes through the day.
  6. MSC Bellissima (MSC Cruises) My Score 3.6
    171,598 GT, 4,434 guests, delivered 2019. Meraviglia's sister ship, based mainly in the Mediterranean and Northern Europe.
  7. MSC Seashore (MSC Cruises) My Score 3.6
    170,412 GT, 4,540 guests, delivered 2021. The first new cruise ship built with MSC's "Safe Air" onboard air-sanitation system.
  8. MSC Seascape (MSC Cruises) My Score 3.6
    170,412 GT, 4,540 guests, delivered 2022. Seashore's sister ship, now based year-round in the Caribbean out of PortMiami.

The ones that just missed it

Two ships came close enough that I checked them twice: Spectrum of the Seas (Royal Caribbean, 169,379 GT, 2019), the first Quantum Ultra-class ship, built for the Asia-Pacific market, and Norwegian Encore (Norwegian Cruise Line, 169,116 GT, 2019), Norwegian's largest ship by tonnage. Both land at 31 and 32.

That second one matters if you assumed Norwegian's newer Prima-class ships (Prima, Viva, Aqua, Luna) would be on this list — they're excellent ships, but they run around 142,500-143,500 GT, which doesn't come close to cracking the top 30. Norwegian's actual biggest ships by size are still the older Breakaway Plus class. Worth knowing before you go looking for Prima on here and can't find it.

So does bigger mean better?

Not automatically. A 250,000-GT ship means more restaurants, more shows, more pools, and genuinely wild engineering — but it also means more people, longer lines at guest services on turnaround day, and a boarding process that can eat half your first afternoon. Some of the best cruises I've been on were on ships nowhere near this list. Size is one input, not the whole decision.

Gross tonnage figures were cross-checked against each ship's own technical specifications and at least one independent industry source as of August 2026. Where sources disagreed by more than a rounding error, the figure corroborated by multiple sources was used and the discrepancy is noted in our research file. Shipyards occasionally revise tonnage slightly after sea trials, so treat any figure within a few hundred GT of another as effectively tied.

Sailing on one of these giants? Pack smarter

A ship this size is a floating city — and city living in a 180-square-foot cabin rewards the right gear. The four things Mark packs every time:

  • 10-pack folding travel hangers — Cruise closets hand you about six hangers for two people. These fold flat, weigh next to nothing, and keep your shirts off the floor by day three.
  • Hanging toiletry bag — Cruise bathrooms have about zero counter space. This one hangs on the back of the door, so your stuff isn't sliding into the sink every time the ship rolls.
  • 4-port universal travel adapter — Ship outlets are hit or miss and the ports are worse. One adapter that covers it, with enough plugs to top off the phone, the watch, and the camera overnight.
  • The relationship saver — Trust me — you'll thank me later. Interior cabins are small.

See all of Mark's gear picks →

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