King Arthur is a legendary king of Britain.

King Arthur may also refer to:

• King Arthur (opera), a 1691 opera by John Dryden and Henry Purcell
• King Arthur (film), a 2004 Touchstone Pictures film by Antoine Fuqua
• King Arthur (video game), a 2004 action-adventure video game by Krome Studios
• Arthur, Prince of Wales would have become "King Arthur of England" if he had not died before his father.

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