Athletic Club of St. Louis, commonly referred to as AC St. Louis, was an American professional soccer team based in St. Louis, Missouri, United States. Founded in December 2009, the team played its first and only season the next year in the NASL Conference of the temporary USSF D2 Pro League, the second tier of the American Soccer Pyramid. With plans to join the new North American Soccer League the following season.

St. Louis played its home games at the Anheuser-Busch Soccer Park in nearby Fenton, Missouri. The team’s colors were green, white, and yellow. St. Louis was first coached by Claude Anelka, the older brother of French international striker Nicolas Anelka;[2] however, he was replaced by Dale Schilly midway through the club’s only season.

The men’s team was one of three parts of the sports club owned by St. Louis-native Jeff Cooper. Saint Louis Athletica of Women’s Professional Soccer, folding in 2010, and a large youth soccer league throughout the metropolitan area were the other components of AC St. Louis.