The Duchess of Cornwall, in Scotland known as The Duchess of Rothesay is the second wife of Charles, Prince of Wales , the heir apparent to the thrones of the United Kingdom and the other 15 Commonwealth Realms.

Before their marriage she had been his long-time mistress. As the consort of the Prince of Wales she is legally HRH The Princess of Wales; although she is officially styled "Her Royal Highness The Duchess of Cornwall" . Although this is unconventional, it avoids a conflict with the princely title which is closely identified by the public with her husband's first wife, the late Diana, Princess of Wales.