The 2020–21 season was the 111th season in the existence of Real Sociedad and the club's 11th consecutive season in the top flight of Spanish football. In addition to the domestic league, Real Sociedad participated in this season's editions of the Copa del Rey, the Supercopa de España, and also participated in the UEFA Europa League. The season covered the period from 20 July 2020 to 30 June 2021, with the late start to the season due to the COVID-19 pandemic in Spain.