Julian Barry (né Julian Barry Mendelsohn Jr.; December 24, 1930 – July 25, 2023) was an American screenwriter and playwright, best known for his Oscar-nominated script for the 1974 film Lenny about comedian Lenny Bruce. Barry adapted the script from his successful Broadway play of the same name. The film, directed by Bob Fosse and starring Dustin Hoffman and Valerie Perrine, was nominated for the so-called Oscar Grand Slam, one of some 40 films to be so honored.

Barry wrote or rewrote screenplays for several notable films including The River, Eyes of Laura Mars, and Rhinoceros, Me, Myself and I, and A Marriage - Georgia O'Keeffe and Alfred Stieglitz (PBS/American Playhouse Production). Barry appeared as himself in the film documentary Pablo, about the graphic artist and film director Pablo Ferro.

Barry's autobiography, My Night with Orson, was published on July 9, 2011, by CreateSpace Independent Publishing Platform (ISBN 978-1-4635-5134-6).