The culture of Osasuna's supporters, known as Los Rojillos, is deeply rooted in the history and identity of Pamplona. From the moment fans arrive at El Sadar, a palpable energy fills the air, intensifying as kickoff approaches.

One of the most emblematic rituals is the famous ‘¡Aupa Osasuna!’, a chant that resonates throughout the stadium. This shout, along with other anthems, becomes a mantra that unites all supporters, creating a symphony of backing that accompanies the team for the full 90 minutes. Fans not only sing; they emotionally invest, cheering and applauding every play, pass, and shot on goal. The connection between players and supporters is evident, and this dynamic turns into a driving force that pushes the Rojillos to give their best.

The atmosphere in derbies against Real Sociedad is particularly electric. These encounters are not just matches; they are battles that ignite passion and regional pride. The stadium fills with a sea of red and white jerseys, while the streets of Pamplona transform into a buzz of songs and celebrations. Supporters share stories and anecdotes, creating a camaraderie that transcends football. The rivalry, while intense, also fosters a sense of community among fans of both teams, who meet in the stands and local bars to enjoy the spectacle.

On match days, rituals begin long before the opening whistle. Many fans gather around El Sadar, where a blend of food, music, and laughter fills the air. It’s common to see groups of friends and families savoring a ‘pintxo’ or a ‘caña’ before entering the stadium. This festive prelude is an essential part of the Osasuna fan experience, setting the tone for the day.

The approach to the stadium is another significant moment. Supporters walk closer while chanting, and the atmosphere grows charged with excitement. With each step into El Sadar, a growing connection between fans and their team is felt. Flags wave and faces light up with the anticipation of the match.

Finally, when the players step onto the field, the stadium erupts with joy. The atmosphere in El Sadar is unique; the echo of fans' cheers melds with the referee's whistle, creating an environment that is both intimidating for rivals and welcoming for the home side.

The culture of Osasuna's supporters is undoubtedly a reflection of Pamplona's passion and pride. Each match is a celebration of collective identity, and every tradition, ritual, and chant contributes to forging an unbreakable bond between the Rojillos and their beloved club. At El Sadar, football is not just played; it is lived with a fervor that is passed down from generation to generation, making every encounter another chapter in the rich history of CA Osasuna.