A Yankee in the court of King Arthur is a literary work of the American writer Mark Twain that frames religious-political ideas and technological knowledge of the author's time in a satirical chivalric fiction.

After intervening in a fight and suffering a blow to the head, the protagonist, Hank Morgan, is transported back in time taking with him all the technological knowledge of the nineteenth century and his republican and protestant ideology to the sixth century in the court of the Arthurian legends .