The Mikado; or, The Town of Titipu is a comic opera in two acts, with music by Arthur Sullivan and libretto by W. S. Gilbert, their ninth of fourteen operatic collaborations. It opened on 14 March 1885, in London, where it ran at the Savoy Theatre for 672 performances, the second-longest run for any work of musical theatre and one of the longest runs of any theatre piece up to that time. By the end of 1885, it was estimated that, in Europe and America, at least 150 companies were producing the opera.

Comic opera, sometimes known as light opera, is a sung dramatic work of a light or comic nature, usually with a happy ending and often including spoken dialogue.