El Sadar Stadium is a multi-purpose stadium located in Pamplona, Spain. It is primarily used for football matches and serves as the home ground for Club Atlético Osasuna, a professional football club. The stadium has a seating capacity of approximately 23,500 spectators and features a natural grass pitch. Opened in 1967, El Sadar Stadium has undergone several renovations to improve facilities and enhance the spectator experience. It is known for its vibrant atmosphere during matches, especially during the annual San Fermín festival, when local fans passionately support their team.