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Quick Answer: Most members of the British Royal Family travel with a standard British passport, just like other UK citizens. The main exception is the reigning monarch. King Charles III does not need a passport because British passports are issued in the name of His Majesty. Queen Camilla, Prince William, the Princess of Wales and other members of the Royal Family do carry passports when travelling overseas.
Do Royals Have a Special Passport?
Despite their royal status, most members of the Royal Family do not have a special type of passport. They use British passports issued through the normal system.
The official royal website explains that the Sovereign does not require a British passport because the document itself is issued in the monarch's name. As a result, King Charles III can travel internationally without carrying a passport.
This rule applied to Queen Elizabeth II throughout her reign. She travelled extensively around the world but never needed to hold a British passport.