Earle Thaddeus Mack, born Earle Thaddeus McGillicuddy (February 1, 1890 – February 4, 1967), was an American player and coach in Major League Baseball, and, during parts of two seasons, manager of the Philadelphia Athletics when his father, Connie Mack, was too ill to manage. He also became a part-owner of the franchise. His nephew Connie Mack III became a U.S. Senator.Mack was born in Spencer, Massachusetts and attended Niagara University and the University of Notre Dame.