The Gonoliers, or The King of Barataria, is a Savoy Opera, with music by Arthur Sullivan and libretto by W. S. Gilbert. It premiered at the Savoy Theatre on December 7, 1889, and ran for a very successful 554 performances (at that time the fifth longest-running piece of musical theatre in history), closing on June 20, 1891. This was the twelfth comic opera collaboration of fourteen between Gilbert and Sullivan.