Castle Films was a film company founded in California by former newsreel cameraman Eugene W. Castle (1897–1960) in 1924. Originally, Castle Films produced industrial and advertising films. Then in 1937, the company pioneered the production and distribution of 8 mm and 16 mm films for home projection, moving its principal office to New York City. It became a subsidiary of Universal Pictures and was eventually renamed Universal 8 from 1977 before folding in the early 1980s due to competition from home video.