Stephen Francis O'Neill (July 6, 1891 – January 26, 1962) was an American catcher, manager, coach and scout in Major League Baseball.

A native of Scranton, Pennsylvania, O'Neill was one of four brothers who escaped a life in the coal mines by playing in the major leagues. Steve had by far the most successful baseball career of the O'Neill brothers. He was a catcher for 17 years in the AL, with the Cleveland Indians (1911-23), Boston Red Sox (1924), New York Yankees (1925), and St. Louis Browns (1927-28). His playing career curtailed by an injury sustained in a car accident, O'Neill compiled a batting average of .263 in 1,586 games, and, in his only World Series appearance in 1920, hit .333 in seven games as the backstop for the world champion Indians.