John Medex Maddox (1789–1861) was a Victorian-era playwright and one-time manager of the Princess's Theatre in London's Oxford Street. Of Jewish descent, Maddox had been born John Medex and used "Maddox" as an ornamental suffix. His brother, Samuel Medex kept a cigar shop directly opposite the Princess's Theatre and his premises became something of a meeting point for London's actors and playwrights.