An Oasis-class cruise ship, Harmony of the Seas is the second largest cruise ship by gross tonnage in the world (226,963 GT), surpassed only by her newer Oasis-class sister ship Symphony of the Seas.

A behemoth of modern cruise ship engineering marvels, Harmony of the Seas can accommodate up to 5,494 passengers at double occupany with 2,747 state rooms spread across 18 decks. She has a sizeable crew complement of 2,300.