The 2021 Argentine Primera División - Liga Profesional (officially the Torneo Socios.com for sponsorship reasons) was the 131st season of top-flight professional football in Argentina. The league season began on 16 July and ended on 13 December 2021. Twenty-six teams competed in the league: the 24 teams that took part in the previous Primera División season as well as two promoted teams from the 2020 Primera Nacional (Sarmiento (J) and Platense). Boca Juniors were the defending champions.