CA Osasuna is a  professional football  club based in Pamplona

CA Osasuna was founded on November 17, 1920, and is one of the oldest football clubs in Spain.

The club's home stadium is Estadio El Sadar, which has a capacity of over 18,000 spectators.

CA Osasuna has played in La Liga, the top tier of Spanish football, for many seasons, and has a strong rivalry with Athletic Bilbao.

 The team's nickname is "Los Rojillos," which means "The Reds" in Spanish, and refers to the team's traditional red and navy blue kit.

Some of the notable former players of CA Osasuna include Roberto Soldado, César Azpilicueta, and Javad Nekounam.

The team's current manager is Jagoba Arrasate, who took over in 2018 after previously managing Numancia and Real Sociedad.

CA Osasuna's biggest success came in the 2005-06 season, when they finished fourth in La Liga and qualified for the UEFA Champions League for the first time in their history.

 The team's main local rivals are SD Eibar and Real Zaragoza, with whom they contest the Basque and Aragonese derbies, respectively. 

CA Osasuna has a strong fan base, with supporters known as "Los Indar Gorri" or "The Red Strength," who are known for their passion and loyalty.

The club has a long-standing tradition of promoting young players from its academy, and has produced several players who have gone on to play for top teams in Spain and abroad.