Club Atlético Unión, commonly known as Unión, is a professional soccer club based in Santa Fe, Argentina. Founded on April 15, 1907, the club has a rich history and has competed in various divisions of Argentine football. Unión's home venue is the Estadio 15 de Abril, which has a capacity of around 27,000 spectators. The club's nickname is "El Tatengue," which refers to the traditional work boots worn by the city's workers. Unión has had success in the lower divisions, earning promotions to the top-tier Primera División multiple times. One of their major accomplishments was reaching the Copa Sudamericana final in 2019, where they narrowly lost to Independiente del Valle.