Club Atletico Osasuna (Spanish pronunciation: [ˈkluβ atˈletiko osaˈsuna], Osasuna Athletic Club), or simply Osasuna, is a Spanish football team in Pamplona, Navarre.
Founded on 24 October 1920, the club currently plays in La Liga, holding home games at the 18,375-capacity El Sadar Stadium. The team's regular home kit is a red shirt with navy blue shorts. Osasuna is one of just four professional Spanish clubs to be owned by their members with an elected president.
Osasuna is the sole Navarrese club to have played in La Liga. Although the club has never won a national trophy it reached the Copa del Rey final in 2005. The best league finishes were fourth in La Liga in 1991 and 2006.
"Los Rojillos" is the club nickname, meaning "The Reds". The word "osasuna" means "health" in Basque, used in a sense of "strength" or "vigour". For different reasons, rivalries exist between Osasuna and Real Zaragoza,Real Madrid, and some Basque clubs, particularly Athletic Bilbao.