Charles J. Sweeney (April 13, 1863 – April 4, 1902) was an American Major League Baseball pitcher from 1882 through 1887. He played with moderate success for several teams, but he is best known to historians for the inadvertent career boost that he gave to future Hall of Famer Old Hoss Radbourn.Sweeney began his major league career with the Providence Grays of the National League in 1882. By the 1884 season, Sweeney and Radbourn were the Grays' two main pitchers.