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 and features a diverse lineup of both international and local artists across various genres, including rock, pop, and electronic music. The festival attracts thousands of music fans each year, creating a vibrant atmosphere filled with live performances, art installations, and food vendors. Rock En Seine has hosted many renowned acts, making it a significant event in the European music festival calendar.