Yes, a valid passport is the "gold standard" for cruise travel and is sufficient for almost any itinerary in the world, including those that visit international ports. While some U.S. citizens can sail on "closed-loop" cruises (those starting and ending at the same U.S. port) using just a birth certificate and a driver's license, having a passport is highly recommended even for these trips. A passport provides you with maximum flexibility: if you have a medical emergency in a foreign port like Mexico or The Bahamas and need to fly home unexpectedly, you cannot board an international flight without a passport. Furthermore, some specific Caribbean destinations, such as Martinique and Guadeloupe, strictly require a passport for entry regardless of your cruise type. In 2026, most cruise lines—including Royal Caribbean and Disney—"strongly suggest" all passengers carry a passport to avoid any potential travel disruptions. Having a passport also makes the "disembarkation" process at the end of the cruise significantly faster, as many ports now utilize facial-recognition technology that links directly to your passport data.