Joyce "Jo" Heims (January 15, 1930 – April 22, 1978) was an American screenwriter best known for her collaborations with actor-director Clint Eastwood. Born in Philadelphia, Heims moved out to the US west coast in early adulthood. She worked various jobs before starting a career writing for film and television during the 1960s. In addition to co-writing the story for Eastwood's role in Dirty Harry, Heims drafted the screenplay for Play Misty for Me, which served as Eastwood's own directorial debut in 1971. Heims continued to screenwrite throughout the decade before dying of breast cancer in 1978.