Julius J. Epstein (August 22, 1909 – December 30, 2000) was an American screenwriter, who had a long career, best remembered for his screenplay, written with his twin brother, Philip, and Howard E. Koch, of the film Casablanca (1942), for which the writers won an Academy Award. It was adapted from an unpublished play, Everybody Comes to Rick's, written by Murray Bennett and Joan Alison.

His identical twin died in 1952, a loss that he felt for the rest of his life. He continued writing, receiving two more Oscar nominations. In 1998, he received a Los Angeles Film Critics Association career achievement award. His credits included Four Daughters (1938) for which he received his first Oscar nomination, The Bride Came C.O.D. (1941), The Man Who Came to Dinner (1942), Mr. Skeffington (1944), The Tender Trap (1955), Light in the Piazza (1962), Send Me No Flowers (1964), Pete 'n' Tillie (1972), Cross of Iron (1977) and Reuben, Reuben (1983).