Sandra Nettelbeck (born 4 April 1966) is a German film director and screenwriter, best known for her film Mostly Martha (2001). Sandra Nettelbeck was born 4 April 1966 in Hamburg, Germany to Uwe Nettelbeck, a German record producer, journalist and film critic, and Petra Nettelbeck, an author, film producer, and actress. In 1988, Nettelbeck began formally studying film at San Francisco State University. While studying, Nettelbeck produced several videos and two 16mm films, including A Certain Grace in 1992, which she won Best Short Film at the San Francisco International Film Festival.

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