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.

After a tryout in Plymouth, the musical opened at the Gaiety Theatre in London, managed by George Edwardes, on 3 February 1900 and ran for a very successful 429 performances.

The cast included Georgia Caine as Nora, Jobyna Howland as Lord Punchestown, May Robson as Mrs. Bang and Flora Zabelle as Isabel Blyth.

[1] Rosie Boote, who played Isabel in the London cast, so charmed Geoffrey Taylour, 4th Marquess of Headfort, that he married her in 1901.