Dr. Jekyll y el Hombre Lobo (Dr. Jekyll and the Wolfman), also known as Dr. Jekyll and the Werewolf, is a 1971 Spanish horror film, the sixth in a series of 12 films about the werewolf Count Waldemar Daninsky, played by Paul Naschy. Naschy actually plays a triple role in the film, portraying Waldemar Daninsky, the Wolf Man and Mr. Hyde. This was Naschy's 2nd film working with director Leon Klimovsky, following their hugely successful 1970 collaboration La Noche de Walpurgis. This film also featured Euro-Horror star Jack Taylor, Mirta Miller and the beautiful Shirley Corrigan of England. The film failed however to reach the box office success of Walpurgis.

The film was in production from November to December 1971. The film was released in Spain on November 13, 1972 as Dr. Jekyll y el Hombre Lobo, in the U.S. in 1973 as Dr. Jekyll and the Wolfman, and in Germany in 1974 as Night of the Bloody Wolves. It was released in the UK in 1973 as Dr. Jekyll and the Werewolf.

It was followed by a 1973 sequel, El Retorno de Walpurgis (aka Curse of the Devil).