Rock en Seine is an annual music festival held in the Domaine National de Saint-Cloud, just outside of Paris, France. Established in 2003, it typically takes place over three days in late August, showcasing a diverse lineup of both international and local artists across various genres, primarily focusing on rock and alternative music. The festival attracts thousands of music fans each year, offering not only live performances but also art installations, food vendors, and a vibrant atmosphere. Rock en Seine has featured renowned acts such as The Cure, Radiohead, and Lana Del Rey, making it a significant event in the European music calendar.