"MS Symphony of the Seas" is an Oasis-class cruise ship owned and operated by Royal Caribbean International. As of 2019 she is the largest passenger ship in the world by gross tonnage, surpassing her sister "Harmony of the Seas".

Symphony of the Seas was built in the Chantiers de l'Atlantique shipyard in Saint Nazaire, France. She is the fourth ship in its Oasis-class series.

"Symphony of the Seas" measures 361.011 metres (1,184.42 ft) in length and has a gross tonnage of 228,081 across 18 decks. She is able to accommodate 5,518 passengers at double occupancy up to a maximum capacity of 6,680 passengers, as well as a 2,200-person crew.

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