Club Atlético Osasuna is a Spanish top-flight football institution based in Pamplona, Navarre, competing in La Liga. The team's fortress is the renowned Estadio El Sadar. Founded in 1920, the club's colors are the distinctive red and blue of Navarre. Under the presidency of Luis Sabalza and with Jagoba Arrasate as head coach, Osasuna is known for its strong identity. The club's history is defined by resilience, community ownership (*sociedad anónima deportiva*), and a fierce fighting spirit, earning them the nickname *Los Rojillos*. A key era was the early 2000s, which included a stunning fourth-place La Liga finish in 2005-06 and subsequent adventures in the UEFA Champions League, led by a gritty, united squad. The modern era has seen Osasuna re-establish itself as a solid, hard-to-beat La Liga side after a brief stint in the second division, consistently achieving safety with a clear, intense style of play. The fan base is among the most passionate in Spain, creating an intimidating atmosphere at El Sadar. CA Osasuna is more than a club; it is the beating heart of Navarre, embodying pride, hard work, and an unbreakable bond with its people.