The Music Master was a theatrical play written by Charles Klein, and produced and directed by David Belasco.
The three-act comedy-drama opened at the Belasco Theatre in New York on September 26, 1904. It ran for 124 performances before it was moved to the Bijou Theatre where it ran for another 511 performances over that and the next two seasons (taking summers off), before going on tour. David Warfield originated the title role, Anton Von Barwig, and continued playing it in revivals and on tour for two decades. William Furst composed the play's incidental music. It was adapted into the film The Music Master.