Louis Bailey Lowdermilk (February 23, 1887 – December 27, 1975), was an American politician and a Major League Baseball pitcher who played in 1911 and 1912 with the St. Louis Cardinals. Lowdermilk had a 4–5 record with a 3.38 ERA, in 20 career games, in his two-year career. He was born in Sandborn, Indiana, and died in Centralia, Illinois. He was the brother of Grover Lowdermilk, who also played in Major League Baseball.