Rudy Behlmer (October 13, 1926 – September 27, 2019) was an American film historian and writer. He was an expert in the history and evolution of the motion picture industry. Behlmer began his career with KLAC-TV in Hollywood as a stage manager. At the beginning of the 1960s, Behlmer started researching and writing articles on various aspects of film history. One such project, a career piece on film producer David O. Selznick (Gone with the Wind, Rebecca), led to his book Memo from David O. Selznick (1972). It was followed by nine other books as well as numerous magazine articles and film music recording booklets. Behlmer also contributed to a wide variety of works about the Golden Age of Hollywood.