Club Atlético Osasuna (Osasuna Athletic Club) or simply Osasuna, is a Spanish football team based in Pamplona, Navarre.

Founded on November 17, 1920, the club currently plays in La Liga, holding home games at the 18,375-capacity El Sadar Stadium. The team tends to play in a red shirt with navy blue shorts, whereas the away kit differs from season to season.

“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.