Club Atlético Osasuna is a professional football club based in Pamplona, Spain. Founded in 1920, the club competes in La Liga, the top tier of Spanish football. Osasuna's home matches are played at the El Sadar Stadium, which has a capacity of around 23,500 spectators. The team's colors are red and white, and they are known as "Los Rojillos," meaning "The Reds." Osasuna has a strong local following and is recognized for its passionate fan base. The club has experienced various successes, including reaching the finals of the Copa del Rey and participating in European competitions.