Rhyller Thriller is an annual horror film festival held in Rhyl, North Wales, described as a blend of a film festival and a horror convention. The event showcases a variety of horror genres, including Giallo, slasher, sci-fi, fantasy, and thriller films, and has featured numerous short films and premieres. The festival includes Q&A sessions and interviews with filmmakers and actors. Beyond the main event, Rhyller Thriller also organizes pop-up screenings and community events, such as bringing age-appropriate genre screenings to local schools.