Baroness Emma Orczy (), usually known as Baroness Orczy or to her family and friends as Emmuska Orczy, was a Hungarian-born British novelist and playwright. She is best known for her series of novels featuring the Scarlet Pimpernel, the alter ego of Sir Percy Blakeney, a wealthy English fop who turns into a quick-thinking escape artist in order to save French aristocrats from "Madame Guillotine" during the French Revolution, establishing the "hero with a secret identity" in popular culture.

Opening in London's West End on 5 January 1905, The Scarlet Pimpernel became a favourite of British audiences. Some of Orczy's paintings were exhibited at the Royal Academy in London. She established the Women of England's Active Service League during World War I with the intention of empowering women to convince men to enlist in the military.

Full name: Emma ("Emmuska") Magdolna Rozália Mária Jozefa Borbála Orczy de Orczi was a Hungarian-British novelist, best remembered as the author of THE SCARLET PIMPERNEL (1905). Baroness Orczy's sequels to the novel were less successful. She was also an artist, and her works were exhibited at the Royal Academy, London. Her first venture into fiction was with crime stories. Among her most popular characters was The Old Man in the Corner, who was featured in a series of twelve British movies from 1924, starring Rolf Leslie.

Baroness Emmuska Orczy was born in Tarnaörs, Hungary, as the only daughter of Baron Felix Orczy, a noted composer and conductor, and his wife Emma. Her father was a friend of such composers as Wagner, Liszt, and Gounod.