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Margarita Sierra (January 5, 1936 - September 6, 1963), born as Maria Margarita Suarez Sierra in Madrid, Spain, was a singer, dancer, and actress perhaps best known for her supporting role as the nightclub-singing Cha Cha O'Brien on the early 1960s ABC/Warner Brothers television series, Surfside 6, with Troy Donahue, Van Williams, Lee Patterson, and Diane McBain.
He also performed those functions on the The Green Hornet TV show, which starred Van Williams and Bruce Lee, although here the narration was limited to the stock opening, the next-episode trailers, and the story-so-far recaps in its three two-part episodes.