Diana Lynn Ossana is an American writer who has collaborated on writing screenplays, teleplays, and novels with author Larry McMurtry since they first worked together in 1992, on the semi-fictionalized biography Pretty Boy Floyd. She won an Academy Award for Best Adapted Screenplay, a Writers' Guild of America Award, a BAFTA Award and a Golden Globe Award for her screenplay of Ang Lee's Brokeback Mountain, along with McMurtry and adapted from the short story of the same name by Annie Proulx. She is a published author in her own right of several short stories and essays.