Fanatic (American title: Die! Die! My Darling!) is a 1965 British thriller directed by Silvio Narizzano for Hammer Films. It stars Tallulah Bankhead, Stefanie Powers, Peter Vaughan, Yootha Joyce, Maurice Kaufmann and Donald Sutherland.
First released in theaters on 21 March 1965 in United Kingdom, it was filmed at Elstree Studios and on location in Letchmore Heath, Hertfordshire, during the summer of 1964. It was Bankhead's final feature film.