John James McCloskey (April 4, 1862 – November 17, 1940) was a professional baseball player and manager. As a player, he appeared in minor league games between 1887 and 1905. He also served as a minor league manager between 1888 and 1932. He is best remembered for managing in the major leagues, with the Louisville Colonels during 1885–1886 and St. Louis Cardinals during 1906–1908, while compiling one of the worst managerial records (in terms of winning percentage) in major league history.