Diana Lynn Ossana (born August 24, 1949) is an American writer. A published author in her own right of several short stories and essays, she is also known for her collaborations with author Larry McMurtry, including the Lonesome Dove series. She won an Academy Award, a Writers' Guild of America Award, a BAFTA Award, and a Golden Globe Award for her screenplay of Ang Lee's Brokeback Mountain.

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