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 is a published author in her own right of several short stories and essays.
Ossana first read the Annie Proulx short story Brokeback Mountain in the October 13, 1997 issue of The New Yorker magazine. She immediately urged her writing partner McMurtry to read it and asked him if he felt they could write a screenplay based upon the story. McMurtry agreed they could. They wrote Proulx asking her for an option to the short story in order to write a screenplay. Proulx replied that although she did not see the potential for a movie in the story, she would agree to their option. Ossana and McMurtry proceeded to write the script, which they completed in early 1998. Ossana's and McMurtry's screenplay for Brokeback Mountain won the Academy Award for Best Writing (Adapted Screenplay) as well as the Golden Globe Award for Best Screenplay and Writers Guild of America Award. Ossana, a producer on the film, also won the Golden Globe Award for Best Drama. The film was released in the United States in December 2005. Brokeback received widespread critical acclaim and it won the Golden Lion (Best Film) award at the Venice Film Festival and the Golden Globe Award for Best Picture - Drama. As a producer, Ossana joined cast and crew during the three months of shooting in Canada.