Dreimal sieben Gedichte aus Albert Girauds "Pierrot lunaire", commonly known simply as Pierrot lunaire, Op. 21, is a melodrama by Arnold Schoenberg. It is a setting of 21 selected poems from Albert Giraud's cycle of the same name as translated into German by Otto Erich Hartleben. The work is written for reciter who delivers the poems in the Sprechstimme style accompanied by a small instrumental ensemble. Schoenberg had previously used a combination of spoken text with instrumental accompaniment, called "melodrama", in the summer-wind narrative of the Gurre-Lieder, which was a fashionable musical style popular at the end of the nineteenth century. Though the music is atonal, it does not employ Schoenberg's twelve-tone technique, which he did not use until 1921.

Pierrot is a stock character of pantomime and commedia dell'arte, whose origins are in the late seventeenth-century Italian troupe of players performing in Paris and known as the Comédie-Italienne. The name is a diminutive of Pierre (Peter), via the suffix -ot. His character in contemporary popular culture—in poetry, fiction, and the visual arts, as well as works for the stage, screen, and concert hall—is that of the sad clown, often pining for love of Columbine, who usually breaks his heart and leaves him for Harlequin. Performing unmasked, with a whitened face, he wears a loose white blouse with large buttons and wide white pantaloons. Sometimes he appears with a frilled collaret and a hat, usually with a close-fitting crown and wide round brim and, more rarely, with a conical shape like a dunce's cap.