Yes, cruise ships check passports in 2026, and the requirements are more stringent than many travelers realize. Even on "Closed-Loop" cruises (those that start and end at the same US port), a passport is the gold standard and is highly recommended. While US citizens can technically use a birth certificate and government-issued ID for some Caribbean routes, they will be unable to fly home from a foreign port in an emergency without a passport. In 2026, most cruise lines require you to upload a digital scan of your passport during the mobile check-in process via their app. Then, a physical check is performed by port agents during embarkation. Additionally, when the ship clears "Face-to-Face" customs in certain international ports, you may be required to present your physical passport again. Many 2026 ships also use biometric facial recognition linked to your passport data to speed up the debarcation process at the end of the voyage.