The 2002–03 season was FC Basel's 110th season of competition, and the club's 9th consecutive season in the Nationalliga A, the top flight of Swiss football. Basel played their home games in the newly constructed St. Jakob-Park complex. René C. Jäggi had been the club chairman for the previous six seasons, but stood down at the AGM in October, and businessman Werner Edelmann was elected as the new chairman. Basel ended the domestic league season as runners-up in the league and winners of the Swiss Cup. They also reached the second group stage of the Champions League.