The Fury of the Wolfman, aka Wolfman Never Sleeps, is a 1970 Spanish horror film that is the fourth in a long series about the werewolf Count Waldemar Daninsky, played by Paul Naschy. Naschy wrote the screenplay as well. The film was shot in early 1970. It was not theatrically released in Spain until 1975 due to problems involved in finding a distributor, although it was distributed in edited form on U.S. TV in 1974.

Jacinto Molina Álvarez known by his stage name Paul Naschy, was a Spanish film actor, screenwriter, and director working primarily in horror films. His portrayals of numerous classic horror figures—The Wolfman, Frankenstein's monster, Count Dracula, Quasimodo, Fu Manchu and a mummy—earned him recognition as the Spanish Lon Chaney. Naschy also starred in dozens of action films, historical dramas, crime films, TV shows and documentaries. He also wrote the screenplays for most of his films and directed a number of them as well, signing many of them "Jacinto Molina". Naschy was bestowed Spain's Gold Medal of Merit in the Fine Arts in 2001.