In Haikyuu!!, the importance of sportsmanship is portrayed through the characters' dedication to fair play, respect for opponents, and teamwork. The show emphasizes the values of hard work, humility, and perseverance in the face of challenges, promoting the idea that success is not just about winning, but also about respecting the game and those who play it. Throughout the series, characters learn the value of encouraging one another, learning from their mistakes, and always giving their best effort, regardless of the outcome.