There's something about mega-ships, those floating skyscrapers laid sideways. So here lies our list of the world's largest cruise vessels, ranked in order of gross tonnage, a measure of volume (and not weight). You'll also find stats on passenger capacity (both double occupancy, the industry standard, and max occupancy, which accounts for all third and fourth beds), length and beam (the width at the widest point).

Click on any ship name for a comprehensive expert review covering everything from cabins to dining, hundreds of reader reviews, deck plans and itinerary info.

Ship (Line - Launched)

Tonnage

Length

Pax (DBL/MAX)

1. Symphony of the Seas
(Royal Caribbean - 2018)

230,000 gt.

1,188 ft.

5,535/6,870

2. Harmony of the Seas
(Royal Caribbean - 2016)

226,963 gt.

1,188 ft.

5,479/6,780 

3. Allure of the Seas
(Royal Caribbean - 2010)

225,282 gt.

1,187 ft.

5,492/6,410

4. Oasis of the Seas
(Royal Caribbean - 2009)

225,282 gt.

1,187 ft.

5,400/6,360

5. MSC Meraviglia
(MSC Cruises - 2017)

171,598 gt.

1,036 ft.

4,475/5,714

6. Quantum of the Seas
(Royal Caribbean - 2014)

168,666 gt.

1,141 ft.

4,180/4,905

7. Anthem of the Seas
(Royal Caribbean - 2015)

168,666 gt.

1,141 ft.

4,180/4,905

8. Norwegian Bliss
(Norwegian Cruise Line - 2018)

167,800 gt.

1,082 ft.

4,004/4,903

9. Ovation of the Seas
(Royal Caribbean - 2016)

167,666 gt.

1,138 ft.

4,180/4,905

10. Norwegian Escape
(Norwegian Cruise Line - 2015)

164,600 gt.

1,069 ft.

4,248/N/A

11. Liberty of the Seas
(Royal Caribbean - 2007)

160,000 gt.

1,112 ft.

3,798/4,960

12. Norwegian Epic
(Norwegian Cruise Line - 2010)

155,873 gt.

1,081 ft.

4,100/N/A

13. Freedom of the Seas
(Royal Caribbean - 2006)

154,407 gt.

1,112 ft.

3,782/4,515

14. Independence of the Seas
(Royal Caribbean - 2008)

154,407 gt.

1,112 ft.

3,634/4,375

15. MSC Seaside
(MSC Cruises - 2017)

154,000 gt.

1,060 ft.

4,134/5,119

16. Queen Mary 2
(Cunard - 2004)

148,528 gt.

1,130 ft.

2,592/3,090

17. Norwegian Breakaway
(Norwegian Cruise Line - 2013)

146,600 gt.

1,068 ft.

3,969/N/A

18. Norwegian Getaway
(Norwegian Cruise Line - 2014)

145,655 gt.

1,068 ft.

3,969/N/A

19. Britannia
(P&O Cruises - 2015)

143,000 gt.

1,083 ft.

3,647/NA

20. Royal Princess
(Princess Cruises - 2013)

141,000 gt.

1,083 ft.

3,600/N/A

21. Regal Princess
(Princess Cruises - 2014)

141,000 gt.

1,083 ft.

3,560/N/A

22. MSC Divina
(MSC Cruises - 2012)

139,072 gt.

1,083 ft.

3,502/4,345

23. MSC Preziosa
(MSC Cruises - 2013)

139,072 gt.

1,093 ft.

3,502/4,345

24. Navigator of the Seas
(Royal Caribbean - 2002)

138,279 gt.

1,020 ft.

3,686/3,990

25. Mariner of the Seas
(Royal Caribbean - 2003)

138,279 gt.

1,020 ft.

3,114/3,807

26. MSC Fantasia
(MSC Cruises - 2008)

137,936 gt.

1,083 ft.

3,274/4,363

27. MSC Splendida
(MSC Cruises - 2009)

137,936 gt.

1,083 ft.

3,274/4,363

28. Explorer of the Seas
(Royal Caribbean - 2000)

137,308 gt.

1,020 ft.

3,286/4,290

29. Voyager of the Seas
(Royal Caribbean - 1999)

137,276 gt.

1,020 ft.

3,286/4,269

30. Adventure of the Seas
(Royal Caribbean - 2001)

137,276 gt.

1,020 ft.

3,114/3,807

31. Carnival Horizon
(Carnival Cruise Line - 2018)

133,500 gt.

1,055 ft.

3,960/5,056

32. Carnival Vista
(Carnival Cruise Line - 2016)

133,500 gt.

1,055 ft.

3,936/NA

33. Costa Diadema
(Costa Cruises - 2014)

132,500 gt

1,004 ft.

3,963/N/A

34. Disney Fantasy
(Disney Cruise Line - 2012)

130,000 gt.

1,115 ft.

2,500/4,000