King of Cadonia is an English musical in two acts with a book by Frederick Lonsdale, lyrics by Adrian Ross and Arthur Wimperis and music by Sidney Jones and Frederick Rosse. It opened at the Prince of Wales Theatre in London on 3 September 1908, produced by Frank Curzon, and ran for 333 performances. It starred Isabel Jay, Huntley Wright, and Bertram Wallis. There was a brief Broadway production in 1910 with additional music by Jerome Kern at the Fifth Avenue Theatre and directed by Joseph W. Herbert.