Caroline F. Siedle (1867 – 1907) designed costumes for the 1903 stage adaptation of The Wonderful Wizard of Oz. Some of her costume sketches for the show still survive. Born in England, Siedle was one of the earliest designers to receive credit for her work in theater programs; she has been called the first woman to achieve recognition as a professional costume designer. She established an atelier in New York City to serve the theater trade, and designed costumes for many musicals, including Victor Herbert's classic Babes in Toyland. She regularly worked for Lillian Russell, and for Julian Mitchell, the director of the Wizard of Oz show.