The 2020–21 was FC Basel's 127th season in existence and the club's 26th consecutive season in the top flight of Swiss football since their promotion in the 1993–94 season. The 2020–21 Swiss Super League season started on the weekend 19–20 September 2020 and ended on 21 May 2021. In addition to the Swiss Super League, Basel also participated in this season's Swiss Cup and the UEFA Europa League.