South Side Radio was a U.S. soccer team in St. Louis, Missouri which spent one season, 1937–1938, in the St. Louis Soccer League.
South Side Radio, also known as the South Siders, spent most of its existence in the lower St. Louis leagues and divisions.
In 1929, it won the Municipal League, at the time the de facto St. Louis second division, championship.
South Side, St. Matthew's and St. Patrick's joined the league.
South Side dropped out at the end of the season after finishing third, but not before winning the league cup.