Margaret Brainard Hamilton (Cleveland, Ohio, 9 de desembre de 1902 - Salisbury, Connecticut, 16 de maig de 1985) va ser una actriu i educadora nord-americana. Va ser més coneguda per la seva interpretació de la Bruixa Malvada de l'Oest, i la seva homòloga de Kansas Almira Gulch, a la pel·lícula de Metro-Goldwyn-Mayer de 1939 El mag d'Oz.

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Margaret Hamilton (December 9, 1902 – May 16, 1985) was an American film actress known for her portrayal of the Wicked Witch of the West in the 1939 film The Wizard of Oz. A former schoolteacher, she worked as a character actor in films for seven years before she was offered the role that defined her public image.

In later years, Hamilton made frequent cameo appearances on television sitcoms and commercials. She also gained recognition for her work as an advocate of causes designed to benefit children and animals, and retained a lifelong commitment to public education.