Robert J. Horner (September 14, 1894 – July 29, 1942) was an American film producer, director and screenwriter. He produced more than 40 films between 1922 and 1935. He also directed more than 30 films between 1921 and 1935. Horner died on July 29, 1942, at the El Paso, Texas City-County Hospital, and the cause of death was cirrhosis of the liver.