Club Atlético Boca Juniors is an Argentine sports club based in the La Boca neighborhood of Buenos Aires. Although many activities are hosted by the club, Boca Juniors is mostly known for its professional football team, which currently plays in the Argentine Primera División.

Boca Juniors is one of the most successful football teams in Argentina, and one of the most successful in the world, having won 43 official titles to date, including its most recent championship, the 2011 Copa Argentina. Domestic titles won by Boca Juniors include 30 Primera División championships, two Copa Argentina, two Copa de Competencia Jockey Club, 5 Copa Dr. Carlos Ibarguren and one Copa Estímulo (AAF), among other titles. Internationally, the team has won 18 international titles, a record shared with A.C. Milan although Boca also won two international titles during the amateur era, the Tie Cup in 1919 and the Copa de Honor Cousenier in 1920, those tournaments created before CONMEBOL was established. Boca Juniors' international trophy haul includes six Copa Libertadores, 4 Recopa Sudamericana, three world club titles (Intercontinental Cup), 2 Copa Sudamericana, 1 Copa Oro, 1 Supercopa Sudamericana, 1 Supercopa Masters, one Tie Cup and one Copa de Honor Cousenier. Boca Juniors is also one of only eight teams to have won CONMEBOL's treble (the others being Olimpia, São Paulo, Independiente, Vélez Sársfield, Cruzeiro, Internacional and LDU Quito). Their success usually has Boca ranked among the IFFHS's Club World Ranking Top 25, which they have reached the top position six times (mostly during the coaching tenure of Carlos Bianchi). Boca was also named by the IFFHS as the top South American club of the first decade of the 21st century (2001–2010). Boca is currently ranked 6th.