Lover of the Monster (Italian: Le amanti del mostro, lit. 'Lovers of the Monster') is a 1974 gothic horror film directed by Sergio Garrone and starring Klaus Kinski.^[3]

Dr. Alex Nijinski (Klaus Kinski) stumbles upon a secret experimental laboratory when he returns to his wife's ancestral homestead. Work in the lab turns the curious doctor into a Jekyll and Hyde split personality, with the evil alter ago going on a killing rampage in the town which is blamed on a pair of tramps.

Although credited, Carla Mancini, Alessandro Perrella and Stella Calderoni to not appear in the film.^[2] Ayhan Işık, Erol Taş and Roberto Messina are not credited in the Italian prints of the film.^[2]

After directing the war film La colomba non deve volare, director Sergio Garrone began work on a horror film.^[2] After contacting the Italian distributor named Sabatini, he was introduced to the Rome-based Turkish producer Şakir V. Sözen.^[2] Sözen had previously produced Farouk Agrama's crime film L'amico del padrino offered the location of a huge villa and proposed casting the Turkish actor Ayhan Işık who had co-starred in Lamico del padrino.^[2] According to Garrone, Sözen suggested instead of making one film in six weeks, that they should make two films in eight weeks.^[2] This led to the production of both le amanti del mostro and The Hand That Feeds the Dead.^[2][4]

Le amanti del mostro was filmed in Istanbul and at Elios Studios in Rome.^[2]

Le amanti del mostro was released theatrically in Italy on 28 May 1974 where it was distributed by Morini.^[2][1]