Jim Tully (June 3, 1886 – June 22, 1947) was a vagabond, pugilist, and American writer. He enjoyed critical and commercial success as a writer in the 1920s and 1930s.

He moved to Hollywood in 1912, when he began writing in earnest. His literary career took two distinct paths. He became one of the first reporters to cover Hollywood. As a free-lancer he was not constrained by the studios and wrote about Hollywood celebrities (including Charlie Chaplin, for whom he had worked) in ways that they did not always find agreeable. For these pieces, rather tame by current standards, he became known as the most-hated man in Hollywood—a title he relished. Less lucrative but closer to his heart were the books he wrote about his life on the road and the American underclass. He also wrote an affectionate memoir of his childhood with his extended Irish family, as well as novels on prostitution, boxing, Hollywood, and a travel book.