Ratboy is a 1986 American comedy-drama film directed by and starring Sondra Locke. The make-up effects were designed by Rick Baker. The film's scenario is at times comic or serious, and one of its peculiarities is that there never is any explanation for Ratboy's origin and existence as a human-rat hybrid.

Principal photography started on September 6, 1985, and ended in October 1985. Ratboy had a troubled production and was both a critical and commercial failure.