Margo (born María Margarita Guadalupe Teresa Estela Bolado Castilla y O'Donnell, May 10, 1917 – July 17, 1985) was a Mexican actress and dancer.

[1] She appeared in many film, stage, and television productions, including Lost Horizon (1937), The Leopard Man (1943), Viva Zapata!

[5] Other notable roles in the 1930s include parts in the 1937 film Lost Horizon and Broadway productions of Maxwell Anderson's Masque of Kings (1937) and Sidney Kingsley's The World We Make (1939).

While Margo continued to act in films until the 1960s, her career was curtailed by the television blacklist that began in 1950, with the targeting of Gypsy Rose Lee, Jean Muir, Hazel Scott, and Ireene Wicker.

[6] In 1950, her name and that of her husband, Eddie Albert, were published in Red Channels, an anti-Communist pamphlet that purported to expose Communist influence within the entertainment industry.

In 1970, along with Frank Lopez, a trade union activist, Margo founded Plaza de la Raza (Place of the People) in East Los Angeles.