For a Royal Caribbean cruise in 2026, the specific ID requirements depend on your nationality and the cruise itinerary. For U.S. citizens on "Closed-Loop" cruises (starting and ending at the same U.S. port), an original government-issued birth certificate and a valid photo ID (like a driver's license) are generally sufficient. However, for all other sailings and for non-U.S. citizens, a valid Passport is mandatory. In 2026, the cruise line "strongly recommends" a passport for everyone, even on closed-loop voyages, as it is the only document that allows you to fly back to the U.S. from a foreign port in an emergency. Regardless of the ID used, the name on your document must exactly match the name on your reservation, and for 2026 travelers, passports must typically be valid for at least six months beyond the date your cruise ends.