James Joseph Callahan (March 18, 1874 – October 4, 1934) was an American pitcher and left fielder in Major League Baseball (MLB) for the Philadelphia Phillies, Chicago Colts/Orphans, and Chicago White Sox. He also managed the White Sox, as well as the Pittsburgh Pirates. In 1902, he pitched the first no-hitter in American League history. Though best known today by his childhood nickname "Nixey", in reality, he was seldom ever referred to by that name in contemporary sources during his playing days, as he instead preferred to go by Jimmy (or James) Callahan.