MS Oasis of the Seas is an Oasis-class cruise ship in the fleet of Royal Caribbean International. The first of her class, she was joined by her sister ship Allure of the Seas in December 2010. Both vessels cruise the Caribbean from Port Everglades in Fort Lauderdale, Florida. She set a new record of carrying over 6,000 passengers.

The ship surpasses the Freedom-class cruise ships (also owned by Royal Caribbean) as the largest cruise ship in the world.