This thesis aims to explore the influences and references, with a particular focus from occultism and western esotericism, found in the film trilogy of The Three Mothers directed by Dario Argento. The trilogy composed of Suspiria, Inferno and The Mother of Tears was produced in a timeframe of thirty years from 1977 to 2007, so it embeds three decades, it also reflects the willingness from the director to disconnect himself from the usual representation of supernatural and horror films of witches and power. The three films Suspiria, Inferno and The Mother of Tears, present an innovative point of view, first of all, the representation of power in the context of horror and secondly, for the nature of references distributed throughout the trilogy. This thesis presents a film analysis of Suspiria, Inferno and The Mother of Tears investigating the semiotics behind the symbols, storytelling, characters, and technical aspects of film production. This work concludes that the deep desk research conducted by Argento on occultism and western esotericism before engaging into the production has deeply influenced it. The references to occultism, western esoteric schools, Steiner and alchemic influences are several, Christianity is also present in the trilogy with a dystopic lent. There is also a gender aspect analysed in the trilogy connected with the representation of feminine power, as the mothers in the trilogy represent witches, a supreme independent source of truth and power disconnected from any Christian and/or masculine representation. Suspiria, Inferno and The Mother of Tears can be then interpreted as a way to challenge the patriarchate power. This thesis is opening with the relevance of references from occultism to be found in several expressions of popular culture in our contemporary society. However, this aspect has not been investigated further than that. It has been utilized to serve the purpose of highlighting the elements in common between Argento’s trilogy and those expressions of popular culture (i.e. horror and supernatural TV series). If this research will be one day extended, the next step would be to find, in other expressions of popular culture (films, manga, graphic novels…), references in line with the ones traced in the trilogy. This would lead to investigate further the way occultism has influenced expressions of art and culture. Another point that is kept for a potential future research, would be to investigate which other examples of horror and supernatural films will be produced (or had been produced), where power and feminine representation breaks the traditional tendency of connecting power either with a Christian notion of evil or with a patriarchal form of power. In this regard, I am sure expressions from Artificial intelligence will come to play a role, but this is due maybe for the future, and maybe for another research to connect these dots.