Kelly Marcel (born 10 January 1974) is a British screenwriter, actress and television producer. She co-wrote the film Saving Mr. Banks (2013) and wrote the film Fifty Shades of Grey (2015), and created and served as executive producer of the television series Terra Nova.
Marcel is the daughter of director Terry Marcel and actress Lindsey Brookand, and the older sister of actress Rosie Marcel.
Marcel has played minor roles in television series such as The Bill, Holby City, and Casualty. She had a largely non-speaking role as Young Vera in the 1994 television film adaptation of A Dark-Adapted Eye.

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