Repulsion is a 1965 British psychological horror thriller film directed by Roman Polanski, and starring Catherine Deneuve. Based on a story written by Polanski and Gérard Brach, the plot follows Carol, a withdrawn, disturbed young woman who, when left alone in the apartment she shares with her sister, is subject to a number of nightmarish experiences. The film focuses on the point of view of Carol and her vivid hallucinations and nightmares as she comes into contact with men and their desires for her. Ian Hendry, John Fraser, Patrick Wymark, and Yvonne Furneaux appear in supporting roles.

Psychological horror is a subgenre of horror and psychological fiction with a particular focus on mental, emotional, and psychological states to frighten, disturb, or unsettle its audience. The subgenre frequently overlaps with the related subgenre of psychological thriller, and often uses mystery elements and characters with unstable, unreliable, or disturbed psychological states to enhance the suspense, horror, drama, tension, and paranoia of the setting and plot and to provide an overall creepy, unpleasant, unsettling, or distressing atmosphere.