Sierra Ditson "Crystal" Moselle (born August 1, 1980) is an American filmmaker. Her debut film was The Wolfpack (2015), a documentary on the Angulo brothers. She has also made That One Day (2016) and Skate Kitchen (2018). Moselle used many of the same actors she filmed for That One Day in her film Skate Kitchen. The film premiered at the Sundance Film Festival. In 2020, Moselle served as writer, director, and executive producer of Betty, an HBO series based upon Skate Kitchen.