Irving Darius Hadley (July 5, 1904 – February 15, 1963) was an American Major League Baseball pitcher. Born in Lynn, Massachusetts, he played in the major leagues for the Washington Senators (1926–31 and 1935), Chicago White Sox (1932), St. Louis Browns (1932–34), New York Yankees (1936–40), New York Giants (1941), and Philadelphia Athletics (1941).