Whether you need a passport to cruise to the Dominican Republic in 2026 depends on your nationality and the type of cruise you are taking. For US Citizens, if you are on a "Closed-Loop" cruise (one that begins and ends at the same US port, such as Miami or Fort Lauderdale), you are technically permitted to use a government-issued Birth Certificate and a valid Photo ID (like a driver's license) instead of a passport. However, this is strongly discouraged by travel experts and cruise lines alike. If you have an emergency—such as a medical evacuation or the ship being forced to dock in a different country due to weather—you cannot fly back to the US from the Dominican Republic without a valid passport book. For all other travelers, including those on "One-Way" cruises that end in a different port, a passport valid for at least six months is mandatory. In 2026, the Dominican Republic has extended entry flexibility for tourists, allowing entry even if the passport has less than six months of validity left, provided it is valid for the duration of the stay, but the cruise line's own stricter requirements usually take precedence.