James Alexander Devlin (June 6, 1849 – October 10, 1883) was an American Major League Baseball player who played mainly as a first baseman early in his career, then as a pitcher in the latter part. He played for three teams during his five-year career; the Philadelphia White Stockings and the Chicago White Stockings of the National Association, and the Louisville Grays of the National League. However, after admitting to throwing games and costing the Grays the pennant in the 1877 Louisville Grays scandal, he and three of his teammates were banished permanently from Major League Baseball.