The Ape Man is a 1943 American horror film directed by William Beaudine. The film is based on "They Creep in the Dark" by Karl Brown, which was published in The Saturday Evening Post. It stars Bela Lugosi as Dr. James Brewster who is aided by his colleague Dr. Randall (Henry Hall). The doctor manages to transform himself into a ape man hybrid and desperately seeks a cure. Brewster believes that only the injection of human spinal fluid will prove effective as a cure. As Randall refuses to help him, Brewster and his captive gorilla seek involuntary donors.

The film was announced in November 1942, began shooting in December and was released in March by Monogram Pictures Corp. The film received negative reviews from Variety, The Hollywood Reporter and The Daily News. An in-name-only sequel, Return of the Ape Man, was released in 1944.