Joseph-Philippe Simon, called Lockroy (February 17, 1803 – January 19, 1891) was a French actor and playwright.
Born in Turin as the son of Baron General Henri Simon, who forbade his son's use of his surname in an artistic career, Joseph-Philippe Simon began as an actor under the pseudonym Lockroy at the Odéon-Théâtre de l'Europe and the Comédie-Française in Paris before devoting himself entirely to writing. For a few months in 1848 he served as provisional administrator of the Comédie-Française.
Lockroy married Antoinette Stephanie, the daughter of the revolutionary writer Marc-Antoine Jullien de Paris. She published two books of her own, Contes à mes nièces (Tales for my nieces, 1868) and Les Fées de la famille (Household fairies, 1886). Their son was the journalist and politician Édouard Lockroy.
Lockroy died in Paris.