Club Atlético San Lorenzo de Almagro, commonly known as San Lorenzo de Almagro, is an Argentine professional sports club based in the Boedo neighborhood of Buenos Aires. It is best known for its football team, which plays in the Primera División, the first tier of the Argentine football league system. San Lorenzo is also considered one of the Big Five of Argentine football, along with Independiente, River Plate, Boca Juniors, and Racing Club.