The Messenger Boy is a musical comedy in two acts by James T. Tanner and Alfred Murray, lyrics by Adrian Ross and Percy Greenbank, with music by Ivan Caryll and Lionel Monckton, with additional numbers by Paul Rubens. The story concerns a rascally financier who tries to discredit a rival in love; it takes place in London, Cairo and Paris.

Félix Marie Henri Tilkin, better known by his pen name Ivan Caryll, was a Belgian-born composer of operettas and Edwardian musical comedies in the English language, who made his career in London and later New York. He composed some forty musical comedies and operettas.