Dorothy is a comic opera in three acts with music by Alfred Cellier and a libretto by B. C. Stephenson. The story involves a rake who falls in love with his disguised fiancée. It was first produced at the Gaiety Theatre in London in 1886. After a rocky start, it was revised and transferred to the Prince of Wales Theatre later that year and then transferred to the Lyric Theatre in 1888, where it played until 1889. The piece had an initial run of 931 performances, breaking the record for the longest-running musical theatre production in history and holding this record until the run of the musical play A Chinese Honeymoon in the early 1900s.