Sir William Courtenay (1477 – November 1535) "The Great", of Powderham in Devon, was a leading member of the Devon gentry and a courtier of King Henry VIII having been from September 1512 one of the king's Esquires of the Body. He served as Sheriff of Devon three times: from February to November 1522, 1525/26, and 1533/34. He was elected Knight of the Shire for Devon in 1529.