Henry John Keupper (July 24, 1887 – August 14, 1960), was a professional baseball player who played pitcher in the Major Leagues in 1914. He would play for the St. Louis Terriers.
Keupper played semi-professional baseball in Southern Illinois until friends recommended him to Frank Donnelly, manager of the Peoria Distillers, who happened to be in Southern Illinois on a hunting trip. His proponents compared him to Orval Overall and Donnelly gave him his first job in professional baseball with the Distillers.