Creatures of Impulse is a stage play by the English dramatist W. S. Gilbert, with music by the composer-conductor Alberto Randegger, which Gilbert adapted from his own short story. Both the play and the short story concern an unwanted and ill-tempered old fairy who enchants people to behave in a manner opposite to their natures, with farcical results.
The short story was written for The Graphic's Christmas number of 1870, and the play was first produced at the Court Theatre on 2 April 1871. It originally included six songs, but three were eventually cut, and some productions dispensed with the music entirely. While the lyrics survive, the music was never published and is lost. Reviews of the play were mostly positive, though it was criticised for the lack of a significant plot or superstructure to support its comic premise. Nonetheless, reviewers found it enjoyable, and it was a modest success, running for 91 performances and enjoying revivals into the early part of the 20th century.
Gilbert had already written a considerable body of stories, plays, poems, criticism and other works before writing Creatures of Impulse. He later wrote the libretti to the famous series of Savoy operas (composed by Arthur Sullivan) between 1871 and 1896.