Charles Herbert Klein (October 7, 1904 - March 28, 1958) was a Major League Baseball player who played for the Philadelphia Phillies (1928-33, 1936-39, 1940-44), Chicago Cubs (1934-36) and Pittsburgh Pirates (1939). Klein was born in Indianapolis, Indiana, and was known as the "Hoosier Hammer." He was one of the most prodigious sluggers of the late 1920s and early 1930s.